If FIFA and national football associations do go ahead with the "affirmed gender" thing, it will be an interesting experiment.
How will 'affirmed' be defined? How will the public in general react to women's teams containing some, then possibly mostly, men? The Lionesses, for instance? How will transmen react when they finally realise they will never play professional football or get into a national team? (I remember a poster on one thread saying a schoolgirl they knew wanting to be a trans boy because she wanted to be a footballer - no chance at all when competing for a contract against biological males.)
I mean, crap for the women who will lose opportunities, but interesting in a long-term, historical studies way.