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I can't tell if you're asking this question because you're asinine, you want attention, you're ill-informed, or all three.
You have to understand that this community has one of the highest rates of mental illness/disorders. Combining mentally ill persons with anime girls/boys is a recipe for disaster.
You want to make mixed-gender collabs more common? Fix mental illness and normalize the collaborations. Don't try to mandate mixed-collabs because a large group won't actually watch. You could simply change your entire audience to fit your goals, but you need to be damn smart about doing it. Be like Joji and learn from how he left Filthy Frank behind to pursue his music.
I'm not going to bother bumping your thread because you haven't actually researched and monitored what the Vtuber audience is like.