YouTube, the company, will be fine. They'll just ban any content that triggers their enforcement systems. I'm worried about YouTube, the platform, and the bastion of free exchange of information and ideas that is has been until now. A response-type video or movie review will almost certainly be false-flagged by a system like this.
Of course, I agree with you that independent platforms are going to have a rough time. They either have to manually review all content themselves, not allow any user-uploaded content, or pay a company to do this for them.