There's a great bunch of these being prototyped by a number of manufacturers.
Sure the enthusiasts are necessarily going to be seeking them for main pc thrills. But for the footprint size of them, they're an ideal pc for those not interested with messing with computers, and still want all the net, office, media stuff.
Games ?.... I bet u could get away with playing WoW pretty well on them. Crysis... eh.
BIG factor is pricing. They have to be around or under console prices, very easy to keep your docs whilst restoring them when they crash.
Overprice these (and the others that come out) and they'll all fail. Johnny won't get one for christmas.