I think the more correct statement is "Why the tablet form factor is more popular". I don't think it's necessarily going to win, and over the long haul, I thin

I think the more correct statement is "Why the tablet form factor is more popular". I don't think it's necessarily going to win, and over the long haul, I think there are ergonomic issues with it. If you hold it flat on your lap, then you don't get a straight-on view of the tablet. And typing is horrendous, and hurts my back after about 30 mins. This is the #1 issue for me. Sure, you can stick it on a stand and attach a keyboard... but then now you have a desktop (not even a laptop, since the keyboard is built it). There are plenty of applications where it works, like most especially reading ebooks, where you don't need to read and type at the same time. Also, if you can incorporate a writing instrument with it and you can write on the tablet, or playing board games, etc. So it's definitely popular right now because it's cool and the designs are pretty sweet. But if you intend to work on it, ie. type and read at the same time, I think over time, serious ergonomic issues are going to turn up.