I REALLY hope I'm wrong about this but I don't foresee Ian and Anisa ever getting divorced. Not because they love each other or value the sanctity of marriage, but because they would both have to admit they are wrong which would be a Herculean task of which they are incapable.
Additionally, Anisa will have a hard time monkeybranching to anyone who is up to her inflated standards and I doubt Ian has it in him to initiate the divorce. Even if we pretend Ian isn't completely buckbroken and raped, he knows Anisa will do anything to make herself look like the victim while siphoning away whatever money he has left. The only way I see a divorce happening is if Anisa comes back to streaming and gets emboldened by paypig simps and coomers into thinking she's hot shit. Even if that happens, I still think an open relationship arc is much more likely.
Anisa would be able to ride the cock carousel and get her BPD attention high/drama fix while still having her poop fingers in icuckzzz bank account.