No more men’s and women’s league, no more “gender eligibility” requirements, a common dresscode, same standards and rules for all.
Edit: since it looks like people missing the word let: the suggestion isn’t to force desegregation. It’s to allow it or even make it the default. Someone else made a good suggestion: segregate by attributes specific to the sport. In boxing it’s weight class, in basketball it could be height, in biking it could even be doped and non doped. Sex and gender need not be the very first thing to segregate by.
The only sport that is a predominantly physical exercise (so excluding things like snooker, darts, archery etc) where women could compete competitively against men at an equivilent level in their sport (league 1 men vs league 1 women) would be ultra marathons. Most other sports is so mis-matched you’d end up with some random amateur bloke against an elite woman.
Basically if you’ve gone through male puberty you are vastly different physically from someone who hasn’t.