How many girls will just drop sports altogether or transfer to all-girls schools?
The people who are nodding this through do so because they such cases will be extremely rare, and it is easier to close one's eyes and go along than to risk being the target of an endless hate campaign from a pack of howling lunatics. And that may be generally correct. A serious injury will raise some eyebrows, but since injuries happen anyhow, it will be discounted. What will really rile the natives is when one of the "transgendered girls" turns out to have a bit of talent, and his team wins three consecutive state basketball championships, there not being any 6'10" legitimate girls who can check him. Pick your scenario for any other sport in which size and strength matter.
Or even better, wait until three or four guys turn it into a joke, and try out for a girls team together.
“all-girls schools”
Sadly, that’s next.
Under this logic, I defy you to describe an “all girls school”. I’ll bet today it’ll include athletes who wear a cup.