If people left YouTube, the creators leave YouTube.
I barely use YouTube at all anymore. But I'm also shelling out north of $50/mo on various artists on Patreon.
I don't really expect other people to follow suit, if they don't have that kind of disposable income.
Incidentally, I also have a subscription to Amazon Prime and HBO Max. The first, because Amazon is functionally the USPS at this point. The second, because I get it free through my ISP.
I'm not going to cancel either one of them, any more than I'm going to give up my car to protest the fossil fuel industry.