>>79205871>turning heelPretty sure ditching Niji would be considered "turning face".
Anyways, to answer your question: I think it would depend heavily on how Finana behaves and who she associates with AFTER leaving. If she turns out to still be on good terms with Mint, Doki, etc. (and maybe reconciles with Sayu), she could probably earn enough goodwill to have at least 3-4 Finanas worth of viewers give her a chance and then start building up a new audience from there?
Otherwise, I expect she'll just end up with about the same numbers she has right now. I doubt she'd lose TOO many of her current viewers on the way out, at least, since anyone who still watches her at this point would have to be insanely loyal.