[rakoo]

> I don't think P2P down to residential is realistic. However, P2P between commercial entities looks more workable.

The nice thing with P2P is that both model are not mutually exclusive. You can have a single peer that is effectively served by Akamai's CDN, and you can have another single peer that is served by you behind your poor ISP line; the protocol will work the same and automatically select the one that offers the better bandwith -- so people will in practice fetch from Akamai's CDN when it has capacity, and automatically switch to anybody else when Akamai alone isn't enough. You don't even need any logic, it will be handled automatically.