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.
A lot of the reason for separate sports and other competitions is because of exclusion due to sexism, not physical differences. Chess for example was riddled with men who refused to play women, or share knowledge, or anything that would help the playing field be anywhere close to equal.
While it would be technically possible to force everyone together, a lot of the separation is so that training and knowledge transfer can occur, women can feel welcome to participate in the first place, etc.
There wouldn’t be anything stopping women having women only teams and competing against mens or mixed teams. And I’d like to believe that we have evolved a little bit since the 70s.