It's a big issue when you consider the very small population with handicaps who can't physically or accurately place their finger on the home button. It's especially surprising considering the Apple's recent push to improve accessibility.
I can't see Apple not finding a work around. And soon.
I would guess that there may already be a work around that we don't know about, but an obvious solution would be a double touch of the power button bringing up the lock screen at which point people could use their gloves on the screen. The bigger issue would be once in, getting out of apps as mentioned by the previous post regarding latex gloves not working... I am guessing this is a short term bug rather than a long term issue (at least, I hope so).