Should we stop splitting sports by gender and just let everybody compete together?
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.
Someone sharper than I am came up with the suggestion of categorising people in a similar way to how it's done by disability in the Paralympics. As to what those categories should be and whether it's practical, let alone possible is another thing entirely.
Basically turn the "categorisation by disability" on its head and make it "categorisation by ability".
As for the all-inclusive idea, I forget where I came across it. Maybe it was a Reddit comment back when I still went there. All I know is that it hadn't occurred to me as an idea and seemed like an idea that better qualified people would be able to flesh out. Or provide reasons it wouldn't work.