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Pen+touch+type seems like a great idea. It is something no other manufacturer has tried to do. Apple Newton MessagePad, 1993. It had a stylus, handwriting recognition, you could use it with just your fingertips, and you could connect an external keyboard. http://www.flickr.com/photos/atow/4314242537/ That was almost twenty years a go. Newton was a very expensive experiment for Apple, and they have learned the hard wa…
And it failed. I think the point is that it's nothing that anyone has tried recently, as the technology just hasn't been good enough. We're in a completely different world than the one in 1993. The question now is whether the technology today is good enough to be usable. No one else has tried it recently, meaning common understanding is that even today it's too complicated/not good enough. Until now.
And once the recognition fails, you're left with computer text that needs to be corrected. How? With a keyboard. So most people just gravitate toward using the keyboard in the first place.
A stylus is better for drawing (see: Wacom) but most people don't draw.