Quite honestly, people will find loop holes around Viacom and still upload stuff that Viacom doesn't want to be on youtue. It could be a music video (main reason why I go to youtube), watch an episode of a tv show, a movie, or a clip of a televiision show or clip to a movie.
The way I see it, people who upload things that could violate a copyright issue arent harming anyone. The only thing that is harmful to people is when people hav to uploead stupid stuff like someone trying to sing a song r commenting on their life or an issue they're having! (I mean really, no one cares!)