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It's no different from the phenomenon of regular streaming on twitch or whatnot.
We have thousands upon thousands of nobodies with 2/3 concurrent viewers. Then medium-sized channels. Then a handful with millions of subscribers. We're already in the late phase of everyone trying out the trend before they realize it doesn't mean instant fame anymore, and dropping it. So yes, a bubble will pop, but the main existing actors will stay.
The only way to make it right now is to innovate, that is, doing something more than using a stupid 2D avatar.