Tablets are great and they serve their purpose as something easier to pick up and go than a laptop. However, tablets by themselves cannot replace the standard PC yet. There is still too much that can't be properly done on a tablet without some hacks or workarounds.
That being said, I love my iPads to death. I use them for browsing, playing games, and watching videos on the go. There are a few other things I use them for but more or less, doing things like game design directly on the iPad is practically unthinkable. Only thing in that general area that I do use it for is just play testing the games I make on iOS. For some reason when I make a game and test it on that and see it working, I get a far better sense of accomplishment than I do when I see it working properly on the PC or in html5.