lol. this is like saying that a new breed of kiwi fruit is going to kill peaches.
looking at the use case, not the actual technology, you will realize, if anything, tablets will kill books, magazines and newspapers the same way that computers killed slide rulers and paper based calculations.
The only scenario where a tablet will take the place of a computer is where someone had an overpowered, under-used computer in the first place to do what a tablet can do.
And lets not forget, the tablet is speaking to computers in the cloud anyway.
orange stained desktop PC cases with 5 unused redundant optical drives FTW!