15 years back...
"Will there ever be floppy disk with capacity more than 1.44 M?"
"Will there ever be floppy disk with higher read/write speeds?"
(For those who incase don't know, what floppy is: http://en.wikipedia.org/wiki/Floppy_disk)
Today, we don't care for an answer to above questions, simply for the fact that 'flop'pies have flopped.
Now, even CD-DVDs are approaching a similar state & have been replaced by Flash drives & Memory Cards. And in years to come, mechanical Hard Disks will follow the suite & will be completely replaced by SSDs.
The root lies in storage technologies involving mechanical movement/rotation are slow, error prone, require more power, make more noise, generate more heat & will be replaced by their non-mechanical counterparts & technology by next decade.