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Safest bet? Finana, I think.
Rosemi I think will definitely leave but I don't know when, so, I don't know if she'll be next. If she wants to do Hololive, Vshojo, whatever, she can do it, and that freedom might actually slow her down while she weighs options.
Dark horse? Nobody is saying anything about Reimu but I think Reimu is gone before end of year.
Hot take? I think Petra won't leave any time soon. She's completely checked out and has been for a while, but I think she's "checked out" in a way where she's not feeling pressure to leave, either. Like, she's so checked out that she's just going to put in the absolute minimum and keep cashing royalty checks until she can't anymore.
Non-starters? Pretty obviously, Enna, Millie, Luca, and Vox are all probably "lifers" unless the branch completely collapses. I can't imagine Aia or Scarle leaving either but it's less of a proactive choice on their parts and more just that they won't have options.