The RIAA has lost focus. Fighting Piracy is a lost cost. There's too much of it to stop. ISPs nor the Government have the resources to stop it all.
If the RIAA had spent the money and resources that they've used to sue people, to revamp their industry and adapt, they'd probably be better off.
It seems there's a market for monthy subscription, all you can eat type services (like netflix for movies). Maybe they should be trying stuff like that.
I don't think ISPs should be held liable. You don't hold electric companies liable because the provide the power for marijuana grow ops?