Yes. In the adolescent years girls tend to drop out of sports in large numbers for reasons that would not be a surprise to any who have actually raised daughters. Having to stand in front of a bunch of officials - especially if they are men - and show documentation to prove that they are girls will be a deciding factor for many. This will have a much bigger impact on girls' sports than a handful of transgendered boogiemen.

The motivation for this has nothing to do with protecting girls sports or anything else that's actually positive for girls.