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Vtubing might be soon history for her, I think she'll be the first mainstream avatar idol, almost like Britney Spears. Hollywood will love her since she'll never age a day. She can hold the spotlight without a new puppeteer for decades. By then, AI would be good enough to take over her avatar.
I say this because realistically, you can't have a decent stream with over 500 people, because the chat is too fast and while, it loses its conversational value. At that point, you're basically just an on-demand entertainment idol.