I don't think you are seeing the big picture. No pun intended

Someone is going to do this eventually. An OS that is scalable. It can work on a small screen, and it work on dual 1080p monitors on a desktop.
I had no issues using a small Lenevo tablet to draw in PS. It was awesome. It was just brought down with a slow processor. And of course, it wasn't tablet sized. It was laptop thick, not tablet thin.
Tons of people are buying MacBook Air's. Why not make something that sized with a stylus for productive folks that need an input besides fingerpainting on a screen? And that's a real computer, with a real processor in small lightweight frame running a real OS.