I don't think it's Hollywood enforcement that has made piracy go down. It's services like Netflix make it easy to watch something for not a silly price. For the fist time not being a pirate is easier for the average person.
Unlike the stuff Hollywood come up with like that Ultraviolet pile of crap they are trying to push. Or the new "super ticket" that replaced it in Canada.
If the US ban VPNs it would A, piss off thousands of companies that use it to join there offices together. B, have as much effect on the rest of the world as limiting encryption key size did for Netscape exports.