alt Hacker NewsI think the inertia of familiar input devices is way too high for something like that to gain any sort of traction. For better or for worse, the mainstream user is probably not leaving his QWERTY keyboard and his touchscreen, even in use cases where those are highly suboptimal.
Keyboards are wildly suboptimal. Inertia is only an issue when you replace suboptimal with only slightly better suboptimal. The transition period from blackberry (keyboard-based phones) to iphones did not take long at all (relatively speaking of course).