It would never happen, indeed.
Imagine trans was predominantly one way, angry bolshy aggressive females becoming male.
Colonising the boardroom, the lodge meet, the golf club, male dating both gay and hetero, the changing room, toilets.
Imagine transmen and activists telling men that those going for medical checks were prostate owners, semen providers, and worst of all...non-women.
Imagine transmen telling men how it was gonna be, disappearing men from football and drinking chat rooms and forums, transmen taking over wherever men previously had the whip hand (all levels of society).
The likes of Harry Styles and Sam Smith telling men they were Nazis and fascists for not embracing their sex based class erasure, and provoking a genocide amongst AFAB for not budging up, moving over, and happily accepting radical re-definition. Gays called out for not accepting female anatomy in their beds.
You have to imagine this world, because it would never happen.
In this world however...