It can't get worse forever, because the badness is bounded by the psychology of the human brain on one side, and the YouTube-enforced standards on the other. Something will eventually have to give.
Right. It only "got worse" while people tried to figure out the new medium. Once we have a set of options that work well, I'd expect this to become a basic meta game. People will recognize the current pattern and begin to associate it with "old". Just like fashion. Probably a bit circular, aka old trends will at some point re-emerge. This assumes YT will be around for long enough, of cause.