In ten years of Microsoft trying to push the tablet as a computer the tablet just hasn't ever taken off. The one thing the naysayers of the iPad have never asked themselves is why has tablet computing failed up until this point?
The answer is simple... they're too under powered to do the work people think they should be doing. Essentially what is happening is people expect to work on a tablet the same way they do on a laptop but the specs of a tablet and the ridiculous price of these tablets make them useless for a computer replacement. In fact the idea that the tablet is meant to replace the computer is actually proof that no one really understands the concept of the tablet.
A tablet computer is not designed to replace computers but to act as a compliment to computers. It's best to think of it as a compliment to a desktop rather than a compliment to a laptop because as soon as you introduce a laptop into the equation people will think it makes no sense to replace the laptop with something so under powered. And to a lesser extent they would be right. That being said though a tablet does make a pretty good alternative to a laptop when conjoined with a desktop.