Youtube will continue to exist but the Youtube we know will die. Eventually it's gonna become another NetflixHulu type thing and only the very top of the absolute top will be able to actually create content for it anymore. The rest will be actual big budget produced shows with actual actors.
Eventually unless you're a creator, you'll have to pay a monthly subscription just to see Youtube. Youtube Red was one attempt, now Youtube TV is another. They're gonna keep pushing it until they push the You out of Youtube and it just becomes a full on subscription service.