Mind you, I'm increasingly seeing the argument coming up that demanding hormone treatment is transphobic - why should they be treated different from "other women" who can compete with natural testosterone levels?
Absolutely, and this is how it will work in practice. It will be dropped as a requirement because firstly it’s unimplementable, and then secondarily because it’s intrusive and “othering”. I have done a couple of sports at a level that, while not professional (because we’re women for fucks sake and that’s a whole other rant!), were taken very seriously by the athletes, and there is absolutely not the slightest chance that anyone even at that sub-pro level would be getting their testosterone level checked. How would this work? Do you test every woman playing in your amateur rugby league, or just the ones that look like they might be male? Are people self declaring, or are you requiring female athletes to “snitch”? How often are you testing? What about in the off season? Which labs are set up to do the testing? Who is paying?
And following that, it will be about how to include non binary male bodied people, who may also describe themselves as trans women and don’t feel comfortable or safe in men’s sports. And you can’t gatekeep by requiring any physical modification.
Here’s my recipe for inclusion: do a sport like triathlon, or mass participation road racing, bike or running. Everyone competes together over the same course, at the same time. You’ll be ranked into your sex category, but so what? If the object is participation, then you’re golden, you’re right there with everyone else, male and female.
You can only argue against that if actually, it’s vital that you are “validated” or that you have to be able to win, and nobody has a human right to that.