I see this as problematic. Throw in different screen sizes, different input methods, and different operating systems, and what do you get? Maddening chaos for application developers, meaning it wouldn't be supported.

Can you imagine the support tickets? "Outlook doesn't look right on my cell phone." "I can't swipe in iBooks on my Eee." It's the ultimate epitome of the problem with Android's fracturing across devices (which is, thankfully, not too bad).