See, I know that, but what I don't understand is how you're getting from "are becoming popular" to "are totally going to replace PCs for the average user." How many people who have a tablet don't have a PC in their home? And while a low-power keyboardless portable device will probably work just fine for most of an average user's typical leisure computing, how many of them (teenagers with large amounts of disposable income excepted) don't have a few text-intensive or processor-intensive (by tablet standards) tasks that they need to take care of (e-mail, budget tracking, 3D gaming, etc.)?
Looking back over my posts, I might come across as a bit of a crank, but I don't have anything against tablets just for being tablets (though I don't have any use for them personally.) However, I don't see them completely supplanting full-fledged PCs (laptop or desktop) for anybody other than pre-adults who spend a lot of time on YouTube and Flash games.
The question to ask is... what do most people have a PC for?
The answer is likely to be: Facebook / twitter / some flash games / some web browsing / pirating some music.
At the place I work at, most people use phones or similar devices far more than they use a PC.
