Unfortunately you'd need a compact input device with good haptic feedback. Obviously it has a keyboard [1], but when the screen fits so nicely over it dropping the screen doesn't seem like such a huge bonus.
As it stands I'd probably prefer a screen for the 2% of my computing time where I actually want my world to be "public".
Still, very cool to see things moving this way!
[1]: Physical buttons are a million times better than a touch screen because you don't have to look at them to know what you are doing.