There will be no more girls athletic scholarships (or female state championships) the minute ONE boy in every sport, in every state, decides to join the female sports team.
High school and college.
It won’t even take that many boys doing it. Maybe 10 boys per state? (How many sports are there?) And the schools can’t refuse, or they will lose funding.
And just like that, girls and womens sports are gone.
Think about physically dominant male athletes in the past:
Jim Thorpe to Bo Jackson. They are rare and only come along once in a great while. By putting boys-identifying-as-girls onto women’s sports teams you are effectively putting a Bo Jackson on every roster and skewing everything from who makes the team to who gets the scholarship.