On topic - I’ll not be surprised if we see a shift of female competitors away from the sports in which they’re almost guaranteed to lose against a trans competitor, toward those where sex doesn’t give an advantage. And then when no women are choosing to compete in those other fields, people will start claiming that women simply aren’t interested in them rather than acknowledge the actual reason why women have stopped bothering.
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Look up "Dick Kerr Ladies" for a historical example of this in action. During the first world war (when all the fit young men were at the front fighting) women's football became a major spectator sport. Into the early 1920s it was drawing crowds into the tens of thousands. On one occasion Dick Kerr Ladies filled Everton's Goodison Park ground to capacity (0ver 50,000 I think in those days). In 1921 the FA then banned women from playing on FA affiliated grounds, a ban which stood until 1969. Not surprisingly, women's participation in football plummeted, and it's only in this century that it's started to claw its way back. So yes, same old story (there's a group of misogynist blokes who don't like women playing sport), new way of achieving the same outcome (instead of an outright ban, just pack women's sports with enough men that they can't ever get the chance of a fair competition).
Incidentally, the timescales to undo this level of damage are sobering. The FA ban was lifted in 1969. Last year (2018) was the first year in which all the teams in the English women's top league were fully professional.
(Even when I was playing 15 years ago, I was told that there was still a rule on the books which meant any player found to be playing mixed football could be banned from playing on an FA affiliated team - the chair of my Sunday league team mentioned this to me when I mentioned playing 5-a-side with the blokes from work on a Monday evening, saying "be careful not to say that within hearing of the opposition coaches, because there is this ancient rule still kicking around...")