Exactly! The same thing could be said about touch-screens. We can do all these things with a keyboard, why need a touch screen. As a matter of fact, that was th

Exactly! The same thing could be said about touch-screens. We can do all these things with a keyboard, why need a touch screen. As a matter of fact, that was the argument Ballmer made during the launch of iPhone. I am not saying Soli would be the same. But it's hard to tell how things would turn out. Or it might take few iterations (maybe from other companies) to get there.