For the vast majority of PC users, a tablet would suit their needs fine. Casual browsing, a quick note or comment to a facebook friend, reading emails.. tablets are just fine and more convenient.
Exactly (although I don’t own a tablet yet, I do have and Android phone). PC are pretty tapped out in terms of power versus end-user usability(IHMO). What I mean is, my base machine is a kick-butt core i5, overclocked with a boss graphics card and SSD drive for the OS. Even with all of that, the hard disk became the limiting factor some time ago. You just can’t push data any faster.
Until someone comes up with a new computing evolution NOT based on the Mealy-Moore machine, then we have about hit our limits.