When you get into the "real world" use of tablets, not Jonny Ive sat lounging with one in an ad, but actually using one, you realise that they're actually a pretty bad idea. The positioning is all wrong. How do you watch a 2hr movie on one? Hold it up or look downwards. Neither are as comfortable as watching a movie on a TV or even a laptop where the screen is supported. Touch screens might be new, but they're not progress over more accurate and faster keyboards and mice.
A tablet offers less than a tablet, with few upsides. OK, they're smaller and lighter, but they're not so small as to give any advantages. Anywhere that you can take an iPad, you can take a laptop.