Sites that review movies or shows could be penalized by law. And who says things would stop there? Fanfic, fanart, things that people have actually been doing for centuries might be halted. Youtube videos that promote both shows/movies and songs or use them could be hatled.
Illegal activities are illegal. But infringing rights won't stop infringing copyright. And not every use of media is even intended to do that.
Censorship has never been considered a fair way to keep the people in line. It's just a way of keeping them in line.
http://en.wikipedia.org/wiki/Stop_Online_Piracy_Act