ISPs just don't want to be made to police copyright offenses for free. if the RIAA/MPAA paid them money to aid in enforcement, you can bet they be doing it in a heartbeat.
well, no, there's no amount of money the riaa/mpaa could pay them, which would justify the amounts lost to terminating services for everyone that's pirating, lol, they'd go out of business
i truly hope you're right. enforcing copyright offenses for downloaders is an absolute waste of everyone's resources regardless of who pays. piracy is a market force, and the corpos need to just acknowledge that.