I think the reason verizon isn't playing along is that they know that if they do, they will end up footing the bill for being the police.
Unless the RIAA finds a way to make the ISPs play along and not burden them with additional costs then I don't see the ISPs cooperating.
You got to be pretty arrogant and greedy to play along with these big boy called riaa,mpaa remember riaa and mpaa are actually run by the same group of ppl so don't think they are separate entity isn't it obvious? greed breeds corruption winner takes all, loser have nothing