That's the thing though. Twitch is now going to have Google's policies imposed on it. That means all of the Content ID and other copyright atrocities. Twitch is going to become basically unusable for its primary purpose. Twitch is not going to survive. The only question is how long it will be before something else takes its place.
In fact, I'd say people migrating to Twitch because they couldn't put their content on YouTube is part of why Twitch grew as much as it did.