However, it presents a huge problem for women's athletics, particularly in sports where strength differences are a large determiner of performance differences. If, as it is said in some circles, a full .5% of the human population is transgender, we are going to continue to see huge increases in openly transgender people competing in sport. In sports where long term exposure to male hormones enhance performance, it's hard to see how life-long XX bodies will be able to compete. Which seems like a bad outcome since the whole point of the existence of women's sport is to allow women to have space to compete without facing insurmountable built-in disadvantages.
It may take a couple more decades but I don't see a stable equilibrium where MTF athletes are competing with cis-women in high level sport, especially if they made their transition during adulthood.
I would be fascinated to hear about different models for how this plays out. I've read the occasional news article about it but I'm not really very familiar with the thinking on the other side of this issue, particularly when it comes to the physical advantages trans women have over cis women in sport.