All it takes it is one user on one site and its shutdown no matter how big or how important the site actually is. That means you can kiss Youtube, Facebook, Twitter, Google+. Any site that allows users to upload content will be shutdown. Lets destroy the largest freedom of speech tool in history because old media's existance and business models are no longer relevant.
You can't complain about piracy unless you have an online alternative to it. Many of the businesses that are supporters of this bill don't have that alternative to piracy, so why should they get a fucking say about how the internet is run when they are not even involved in selling their content on it. One day America will just have a wall like like the great firewall of China but the diffirence will be that it won't be built by the US goverment.