Before doing this, I like to look at what might have been lost. The following 133 tags have been created by users with < 1500 reputation at the time of creation during the past 365 days and are currently in-use on at least 2 questions:
Name Used User Created RepOnCreation
------------------------ ---- ------------------- ---------- -------------
sublime-text-3 90 Kriem 7/22/2013 404
windows-8.1-upgrade 90 Joey Adams 10/19/2013 658
sublime-text 42 Lohoris 9/13/2013 701
chromecast 35 Raj More 10/4/2013 515
ubuntu-13.10 33 Vladimir Oselsky 1/2/2014 332
google-chrome-devtools 31 MoonSire 11/12/2013 442
dos 23 SofaKng 1/22/2014 327
fedora-19 20 wullxz 9/11/2013 1217
smime 17 DeepSpace101 8/1/2013 538
fedora-20 16 ChocoDeveloper 3/1/2014 739
raspbian 15 Bart van Heukelom 5/8/2014 882
xfce4 14 lang2 9/24/2013 436
microsoft-surface-pro 13 Matt Clark 11/5/2013 304
libvirt 12 mavit 9/27/2013 310
iis-8 11 Feroc 8/14/2013 345
xenserver 11 Alex 11/6/2013 339
unresponsive 11 Mike Pateras 11/3/2013 356
firefox-developer-tools 10 MoonSire 11/12/2013 444
mariadb 10 mickburkejnr 8/3/2013 730
window-8 10 curious_kid 12/28/2013 342
remoteapp 9 damryfbfnetsi 1/14/2014 364
downloading 9 broiyan 11/7/2013 357
index 8 Martin Prikryl 4/7/2014 932
sfc 7 galacticninja 12/29/2013 1423
for-loop 7 Kirstin 12/5/2013 1018
cmake 7 Chen Levy 8/13/2013 645
font-smoothing 6 Robert Koritnik 9/3/2013 468
tampermonkey 6 Brock Adams 2/6/2014 672
pycharm 6 Anthony Kong 2/26/2014 401
traktor 6 Franck Dernoncourt 4/6/2014 513
search-indexing 6 Flak DiNenno 4/8/2014 594
reference 5 Ian McClellan 3/12/2014 300
mapped-drive 5 GSerg 3/27/2014 388
beaglebone 5 Krumelur 4/1/2014 343
hiren 5 rossmcm 9/15/2013 391
sata-to-usb 5 soul 9/29/2013 1314
pgadmin3 5 Eric Leschinski 8/10/2013 499
whatsapp 5 Antony Lee 8/4/2013 340
sccm 5 Myrddin Emrys 11/26/2013 1006
internet-explorer-dev 5 MoonSire 11/12/2013 462
html-mail 5 Camilo Martin 10/22/2013 619
hangouts 4 Ash 10/16/2013 829
bonding 4 Nemoden 11/6/2013 356
quod-libet 4 unor 11/21/2013 578
windows-features 4 Brian Lacy 12/17/2013 746
mpeg2 4 Eli 7/25/2013 431
vb6 4 nate 10/9/2013 492
gridengine 4 gojira 10/10/2013 592
windirstat 4 Josh R 9/10/2013 737
fontforge 4 Eliptical View 1/20/2014 333
cmder 4 Zsolt Botykai 1/16/2014 399
omnibox 4 D.Iankov 4/16/2014 1471
elementaryos 4 Deniz Zoeteman 4/28/2014 397
oracle-linux 4 Simkill 5/8/2014 1224
autologon 3 Colyn1337 4/28/2014 622
parted 3 wiak 5/2/2014 375
superputty 3 Franck Dernoncourt 6/15/2014 691
atlassian 3 Unnikrishnan 4/17/2014 601
lftp 3 wiak 4/16/2014 365
displayfusion 3 Franck Dernoncourt 3/21/2014 493
offlineimap 3 winchendonsprings 1/8/2014 457
evil 3 progo 1/16/2014 379
opensuse-13.1 3 djechelon 2/7/2014 1275
ffserver 3 Yasser Zamani 2/9/2014 583
lighttable 3 erikvold 2/26/2014 793
zorin 3 Zonder 3/6/2014 535
freeradius 3 Augustus Francis 3/13/2014 370
dax 3 Andi Mohr 9/27/2013 342
sparsefile 3 Michael Yasumoto 10/12/2013 385
difftool 3 Tiago Veloso 8/1/2013 897
remmina 3 Eric Leschinski 8/6/2013 474
icedove 3 l1zard 8/9/2013 508
adobe-audition 3 Lynda 8/14/2013 1218
shebang 3 Ole Tange 8/21/2013 595
clojure 3 golimar 8/28/2013 515
feature-regression 3 naxa 11/21/2013 1204
adobe-creative-cloud 3 damryfbfnetsi 1/7/2014 302
slate 3 Duijf 12/1/2013 559
config-files 3 thejh 12/4/2013 405
apt-cache 3 Peter Westlake 10/30/2013 526
badbios 3 Ash 11/4/2013 965
radvd 3 Dolda2000 10/20/2013 355
mogrify 2 wim 10/23/2013 522
mime-headers 2 Frank 10/28/2013 454
rj-11 2 Ash 11/15/2013 1056
elevated 2 Langhard 12/5/2013 410
jmeter 2 TusharG 11/25/2013 695
lotus 2 Antony Lee 11/27/2013 540
stylish 2 Rookie 11/28/2013 363
pkcs 2 XXL 11/28/2013 738
lsusb 2 Jonathon Reinhart 1/7/2014 478
libusb 2 Jonathon Reinhart 1/7/2014 478
statsvn 2 smokris 12/6/2013 434
eraser 2 oscilatingcretin 12/8/2013 876
clearos 2 NitroxDM 8/28/2013 341
msklc 2 Lohoris 8/20/2013 738
iftop 2 Eric Leschinski 8/11/2013 499
elpa 2 Chen Levy 8/13/2013 645
awstats 2 JoshRibs 10/13/2013 443
psi 2 unor 10/2/2013 559
pipelining 2 Maxim V. Pavlov 10/4/2013 319
tcpreplay 2 vpram86 9/26/2013 1105
tarsnap 2 Avery Chan 3/21/2014 753
smb2 2 Alexander Gladysh 3/12/2014 311
ipkg 2 Alexander Gladysh 3/12/2014 311
udisks 2 Envite 4/3/2014 350
eap-mschapv2 2 Adambean 3/31/2014 496
network-policy-server 2 Adambean 3/31/2014 496
keyremap4macbook 2 Peeja 3/10/2014 346
octopress 2 Anthony Kong 3/2/2014 406
moinmoin 2 lorenzog 2/26/2014 1106
logcheck 2 Eddie Parker 2/12/2014 331
surface-2 2 Ben Johnson mk2 1/24/2014 640
office-on-demand 2 damryfbfnetsi 1/28/2014 390
sata-cable 2 Sickest 2/4/2014 742
braces 2 java.is.for.desktop 1/16/2014 435
icicles 2 Drew 1/16/2014 623
terminal-multiplexer 2 shinokada 12/31/2013 307
ssis 2 Andi Mohr 1/15/2014 551
sqoop 2 P.Brian.Mackey 4/7/2014 679
nconvert 2 wiak 4/17/2014 365
memory-speed 2 yosh m 4/9/2014 1133
p2v 2 user1301428 4/17/2014 1413
answerfile 2 Colyn1337 4/28/2014 622
noip 2 einpoklum 5/9/2014 318
msiexec 2 Stefano Borini 6/6/2014 582
system-notification-area 2 Edward Brey 6/7/2014 445
texmaker 2 Franck Dernoncourt 6/15/2014 703
usbip 2 davidbaumann 6/17/2014 873
smart-tv 2 PHPst 6/30/2014 554
append 2 nmuntz 7/2/2014 497
centos-7 2 Rob 7/10/2014 373
google-chrome-canary 2 Shimmy 5/6/2014 433
For contrast, users with >= 1500 reputation created the following 93 tags (again, only those in use on at least 2 questions):
Name Used User Created RepOnCreation
------------------------- ---- ---------------- ---------- -------------
cmd.exe 264 slhck 8/28/2013 62885
onedrive 199 tombull89 1/27/2014 4827
windows-server-2012-r2 67 soandos 8/7/2013 14810
hp-elitebook 65 DragonLord 7/27/2013 8319
visual-studio-2013 57 Ƭᴇcʜιᴇ007 9/20/2013 37956
kali-linux 55 tapped-out 8/4/2013 2537
ubuntu-14.04 51 Devid 3/31/2014 1906
heartbleed 23 DragonLord 4/8/2014 10340
email-filter 21 Breakthrough 7/1/2014 24324
preview.app 18 slhck 8/24/2013 62426
microsoft-powerpoint-2013 18 Paul 9/23/2013 22054
textmate-2 16 slhck 8/28/2013 62909
windows-8-refresh 16 Oliver Salzburg 3/19/2014 36867
weechat 14 tapped-out 9/2/2013 2709
cutepdf 14 wonea 9/24/2013 1579
file-filter 14 Breakthrough 7/2/2014 24324
windows-libraries 12 Darth Android 7/18/2013 19649
lpt 11 sammyg 8/4/2013 1690
resharper 11 wonea 9/25/2013 1585
powershell-ise 10 Iszi 8/12/2013 3167
citrix-receiver 10 wonea 9/7/2013 1528
docker 10 Oliver Salzburg 3/31/2014 37486
gitlab 10 Sathya 3/4/2014 35232
bittorrent-sync 9 Ilari Kajaste 11/22/2013 1853
footers 9 WilliamKF 9/17/2013 1692
bufferbloat 8 Kevin Panko 10/16/2013 2762
miracast 7 tombull89 9/27/2013 4630
av-receiver 7 wonea 9/7/2013 1528
powershell-4.0 7 Louis 11/23/2013 5583
icalendar 7 tapped-out 10/6/2013 2889
intellisense 7 AthomSfere 10/10/2013 4782
iperf 7 sammyg 11/1/2013 2273
windows-2012 7 PeanutsMonkey 3/11/2014 2034
zabbix 7 ekaj 1/8/2014 2151
tuleap 7 Sathya 5/28/2014 36008
4k-resolution 6 WilliamKF 6/4/2014 2034
tails 6 Daniel Beck 5/1/2014 58204
exchange-2013 6 ppumkin 4/3/2014 2341
serial-number 6 netvope 1/5/2014 1501
microsoft-access-2013 6 soandos 1/10/2014 15553
tiles 6 MatthewThepc 11/23/2013 2154
static 6 Ben Richards 12/6/2013 6504
widi 5 Pops 11/9/2013 3062
rdiff-backup 5 davidgo 12/28/2013 7297
mega 5 wonea 9/15/2013 1552
external-dvd 5 davidgo 8/17/2013 4678
sequel-pro 5 slhck 10/3/2013 65843
chocolatey 5 Julian Knight 5/29/2014 6010
osx-yosemite 4 slhck 6/4/2014 78824
tsv 4 Indrek 4/15/2014 12291
windows-embedded-8 4 Ƭᴇcʜιᴇ007 9/30/2013 38495
microsoft-excel-2000 4 wonea 9/26/2013 1585
dia 4 wonea 9/5/2013 1518
steam-os 4 Oliver Salzburg 12/14/2013 34329
guid 4 Synetech 12/20/2013 33862
roles 4 Keltari 12/2/2013 18089
multiarch 4 Vi. 12/5/2013 3842
clink 3 Charles Roper 12/5/2013 3844
qmail 3 Michael Kjörling 1/3/2014 6510
melt 3 slhck 1/10/2014 71506
brackets 3 Oliver Salzburg 3/19/2014 36867
worm-media 3 Kevin Panko 2/20/2014 3405
edible-ink-printing 3 rob 3/3/2014 8302
digikam 3 wonea 9/4/2013 1512
adobe-bridge 3 tapped-out 8/31/2013 2682
placeholder 3 Hennes 8/26/2013 24432
carddav 3 ridogi 8/27/2013 2185
metasploit 3 wonea 9/24/2013 1579
openscad 3 Kevin Panko 10/24/2013 2784
rsnapshot 3 lajuette 10/28/2013 3274
802.11ac 3 Evan Carroll 5/24/2014 1523
dm-crypt 3 Gilles 6/13/2014 29685
fusion-drive 3 slhck 6/25/2014 80066
google-compute-engine 2 slhck 6/25/2014 80102
zenoss 2 Oliver Salzburg 6/19/2014 39519
plex 2 BigHomie 5/26/2014 2800
can-bus 2 evan.bovie 5/3/2014 2157
magento 2 Brian Knoblauch 5/6/2014 2877
gdisk 2 Mikhail 4/21/2014 2126
rogue 2 Keltari 4/2/2014 20865
thrashing 2 endolith 11/1/2013 1640
windows-ics 2 tapped-out 10/6/2013 2889
karma 2 wonea 9/18/2013 1552
pcoip 2 Brian Knoblauch 8/15/2013 2702
megui 2 wonea 9/14/2013 1546
personal-block-list 2 Al E. 2/8/2014 2454
nexus-5 2 Nathan Long 1/4/2014 3256
block-device 2 davidgo 12/31/2013 7327
multics 2 Kevin Panko 12/4/2013 3028
robots.txt 2 Nicu Zecheru 12/10/2013 2872
hexchat 2 Chipperyman 11/21/2013 1533
faketime 2 terdon 10/14/2013 18370
ask-toolbar 2 ChrisF 11/24/2013 32141
During this same time period, 479 tags were destroyed, either because they were merged into another tag, weren't used on any questions, or because after 6 months they were only used on 1 question and had no tag wiki describing their intended use. It's not possible for me to determine who created them.
###My recommendation:
Implementing this would be unwise at this time. Super User covers a large number of systems and products, many of which don't have tags. If we're going to further restrict the ability of folks to create new tags, those with the privilege need to be stepping up to create them when needed. Right now, that doesn't appear to be happening consistently: the majority of tags that end up being used more than once is done by users who would no longer be able to if we raised the privilege level.
Note that we recently implemented warnings for new tag creation - whether this will serve to slow the creation of unneeded tags remains to be seen.
###Appendix: tags removed during the past 365 days
Here is a full list of tags removed during the last 365 days, for any reason. There are a total of 703 of these tags, which reflects both a different time period from that above (I'm adding this information a month or so later) and an improved method of scraping the log files for this data (don't use SQL when you need a regex):
offline untagged vcf 1password canadian-luke excel-2010-mac microsoft-outlook-2000 idle uhd 4k warning subject case-sensitive pattern insertion-fault file-dialog poster-printing freebsd-install open-file-dialog quicksearch printer-sharing cfosspeed uniform-server spec pdf-xchange-viewer micro-receiver intel-mic xmlsec copy.com zeitgeist bing-bot unicorn vswitch smartart gns3 parentheses symbop transformer pty fuser device-id disposal kids education f-lock invisible icall tesseract billing tiling r61 jdownloader sync-center core-pattern minitool simple-mapi rcirc google-app-launcher screenpresso ctrlp-plugin p910nd opensearch teradata sqla libopus conve appcmd physicalpath zarafa human-insensitive windows-8.1.1 instruction-register memory-buffer-register memory-data-register protel unlink data-formatting email-formats formatted comfort books emoji loop program-counter-register memory-address-register future technology executable output net disable quit program micosoft-word-2010 h265 vp9 cleanup jetty oncenote exchangeonline system system-hang hdf system-load omr untagged refresh hack support microsoft-office-365 virtual untagged windows-2008-r2 cost-efficiency div google-webmaster-tools devices activation pinterest pelican sql-anywhere windows-service-packs hotplugging pinterest microsoft-word-mac2011 ayiya freetype google-reader maildrop spin-down chrome-url centreon emp modi sourcetree ld-preload diehard boolean-operators caja autopager facetime imessage amd-raidxpert git-tfs self-healing transplant amule xnest index idea brew verizon-wireless skydrive sqltools virutalbox fat surface-pro-2 google-hangout groupware business-catalyst call-forwarding rich-snippet lines paintbrush printer-drivers windows-virtual-pc windwos tesla dvd-flick untagged close-application command operations developer-tools application-switching app-switching gigabit batch-processing das t pbs video-drivers illustrator word-2011 hyphenation flyout sd airprint mdsn excel-2000 customization business-model tamil pdc ntds communication targetprocess plot tkinter rpm-spec tracking-protection-list tiemu windows-phone-emulator outlook-data carp hsqldb porting legalnoticetext initcwnd power-saving-mode bitlord idl megui git-daemon ddl metro-twit belvedere daylight-savings-time find-and-run-robot minimize client .pst .ost magic microsoft-exchange access reliance economics capacity timeclock 2003 lockup stop utility leak different date-range reddit word-2013 surface failure iphone-5 grainy vigor2920vn vigor named-formula fusion access-denied details zombie scientific-linux-6 untagged vintage mapping server foxit minimal-install computer-forensics old-hardware opengrok snagit nucleus-rtos x2go apache-openoffice airprint spdy reformat watts filesystem-limits fireworks programming cell-phone minimize wp-mobile padding rawtherapee network-design refresh access data-destruction on-board-raid indirect-reference full-hd untagged loop redhat-6.2 stmp proxycap d android-recovery signature-verification liveticker marquee videowall chrome-canary game-server can errors adb default-browser default microsoft-office-xp magento eucalyptus exe menubar ultimate-edition open-with 4g lte external-antenna downtime beep untagged hide google-ultron france start dictconv configure middle-mouse-button x1 auto-hide active-window hide-window system-defaults requests network-policy-serverb blackscreen laptop-displayblackscreen pi endianess raspian home development-environment sublime multiarch timesheets ghostview numactl ach-linux yammer umsdos paperport feedgnuplot tos mkfs.vfat mtools archivemail intensifypro nut cronolog photoshop-cc chiliproject zend-framework install4j drobo-5n ssdt neorouter hwnd microsost-word-2011 window-8 disk win-key keys matching html-editor reload intermittent blocked surface malicious sound server-side awesome rssi microsoft-kb areca ieee1284 braille fsnotify stereo-mix pelican retext wodim yahoo-search couchbase rednotebook x-raid2 dicom shopping autodesk-sketchbookpro akmod actor actors tracert edible-printing idm arrow lang rfid pendactyl micro-sd secure php-fpm hack product-number forward-seek audio-port smbios offline single-bit-error whmcs operator frustration desperation oracle-11g debian-7 digital-frame prices internet-explorer-desktop expand collapse thinkapd disk-erasure full-path dschychronize virus-scanning hash-value verify sdd inst link2sd dect bah e-bay help-vampire chiliproject haiku-os-pm help-vampire chiliproject nvida microsof-access objectdock fignore outlook-mac mktemp freeswan altgr shim mac-hg term aalib archey yakuake cloudflare bomgar elluminate group-polcy js dragon-dictate tf team-explorer document-library sato-printer ccsvchst.exe mru remi-repository scilab simulink xcos invalid-ip microsoft-photo-editor chksk span horizontal hack dualboot vertical visudo untagged ifttt dos ipmi skype-manager excle oraclelinux google-wallet preload dotnetnuke external-card mtputty editpad defender gphoto where dmake autodesk-animator vgaswitcheroo respawn dynamo cpumon cstates network-block-device nbd povray pci-dss intel-vt telepathy lycom tonido umdh extension-cable total-copy security-camera kget pydev dsquery adfind hpf370 duplicate-files developer metro powerpint sche osc ns3 accent blurred start-button dual-boot sql-azure re-encapsulation chrome-app-shortcut configuration headless-ubuntu ginn distcc microsoft-outlook-forms aero-shake colorfultabs sar goldwave sbcl nofiles resin activebatch apk kmscon lilypond xpages cwd snapper userchrome.css pny rst insensitive nsswitch smartos access-denied sharing shares mac-filter stability excel-for-mac electricity untagged foot-bullet epic stata flickering calc qubes winclone middle-mouse-button tagging nuevi netiquette focuswriter conversation elementaryos hidden openfine name untagged zotac plc electricity catalina fontforge ufd aafp plotting server simultaneous powerline intel-xeon link-shell-extention soft-link windowsspeechrecognition full-computer-name licencing detect receiver entertainment state desktop-window-manager window-management maximize v2p snapping edge photography current portfolio parentheses prototype brands online school dust mockup apache-2.4.6 request-tracker font-color textmate2 gpo custom guide conflicts guidelines locked drbd disqus category sublime plugings core-dump reading-pane recurring polish topology information override starter reader break deleting online-resources logo ldme product-comparison auditing haiku-os 1.2.5 ise packa gauthenticator untagged hipchat missing-dll menus ost2pst whited00r scattergraph sar insertion-loss primary-zone delegation virustotal non-printable apache-solr texworks xfsm currency-conversion dxtory desktop-mode bottom-posting cacti hash-table backup-sqldatabase smtp-client window-maker lucidchart ttcp lucene gitstack appledouble piping total-eclipse troff cde safari-6 safari-webinspector photostream psreadline compi archicad lmde apu psb libtermcap disconnected