I think they're onto something. If there is any way to hammer out some better multi-monitor support, I could totally see running both your "home computer" and your "gaming system" on a single PC. In this way, mom or dad can do their facebooking and grownup tasks on the actual PC while the kids play Steam.
I think this would be possible because CPU core count is going up, and typical CPU utilization of games rarely goes over 80% because perfect parallelism is near impossible to achieve.
Clearly there are some underlying OS issues, namely that of Windows multi-monitor support and perhaps using multiple keyboards and other HIDs. This could be why they're experimenting with Linux. Of course, this is all wild speculation, but I don't think it's out of the realm of possibility.