It isn't real....SOPA hasn't even passed yet
What do you mean it isn't real?
And of course it hasn't been passed yet, other wise we wouldn't be signing a petition to stop it from happening, because it would have already happened.
And if it did pass, youtube could very well go under.
At the moment, the reason youtube still stands is because they aren't liable for copyrighted material on it, they just have to take it down, but if it does take effect 3rd party hosts of copyrighted material would be removed from the DNS, meaning no more youtube.