Fast-forward to now, and laptops have caught up. SSDs killed the boot advantage, and new form factors made possible by the same techniques that worked in the tablets have closed the size gap. If I can get an 11" laptop that does "real computer" stuff, boots instantly, and runs quietly and comfortably in my lap... I don't really have a use-case for the tablet anymore.
Or we could just be a bit more forward thinking and see that somewhere on the horizon* someone's just going to slap a keyboard and wireless mouse to a tablet and make it a bit easier for people who prefer that way of doing things. In this way the machine can be made into what's needed at the time without having to own two machines that do the same thing just in a different form factor.
* You know, like HP had on the TC1100 over a decade ago...