I mean if legally they can block bittorrent or other protocols, does it mean that one could create a new protocol each time it's legal to block it, rince and repeat, and force the legislator to create a new law forbidding each nez appearing protocol?

Also one might implement ways to prevent protocol detection into a BEP, but if comcast ends up shutting down any traffic that is peer to peer... I wonder if legally they could forbid any traffic that is "too much peer to peer" and argue that it's illegal downloading. Hard to say if comcast could win in court, because if you do the stats, most of peer to peer traffic is indeed illegal.

The internet could end up without any peer to peer traffic, and only works with servers, most users would not really complain, things would still work like they already are. It would really create pressure from users to change ISP.

Some ISPs might not block peer to peer, and I wonder if subscribers would end up moving out of neighborhoods where comcast has a monopoly.