Your first point is actually a boon for P2P. If it is cheap enough for users to rent bandwidth closer to each other, that will solve the same problem CDNs solve

Your first point is actually a boon for P2P. If it is cheap enough for users to rent bandwidth closer to each other, that will solve the same problem CDNs solve. As for points two and three, decentralization does not mean 100% symmetry, just relatively more. I have a symmetric connection, and can forward ports without any fuss, and rather enjoy those advantages. Even so, I download quite a lot more than upload. I don't expect that to change much, even with significantly more P2P traffic. There are a few things where I am really frustrated with other's inability to forward ports, especially video games and VOIP.