01 Aug 2009 at 17:25 - 3
I've seen a similar system demo'd at last year's GDC. It was intended as a game version of a pay per view, and the only thing they'd say for sure is that any connection capable of streaming a 1024x768 movie flawlessly, you'll be able to stream a game at the same resolution.
The thing is that was a company that intended to use their own servers and computers to stream the games, meaning they could guarantee those kinds of speeds.
As a p2p service... I just can't see anyone without a cable line being able to host at an acceptable quality.