I don't game nearly as much as I used to, but it would be nice to have the option to play some games without being forced to use Windows; that's the reason I'm interested.
Personally I suspect the move will be to micro media playing machines acting as home hubs. If they can get good game support and Skype / Netflix integration with a nice UI skin then they could seriously undercut the likes of 720 and PS3 which might be more attractive to many users in the present economic climate.
My theory is that Valve is planning on doing just this. There were the rumors of the "Steam Box" which would be running on PC hardware. If they ran a super stripped down Linux distro with a fancy console-esque UI, the hardware requirements could be somewhat lower, dropping the price of the unit.