I don't wonder. I'm pretty sure I know.
Exhibit A is the University of Wisconsin. At one point, it was hailed as an NCAA "model institution" for its policy against scheduling games with schools that have American Indian nicknames. More recently, UW received an F grade from the Black Coaches Assocation for refusing to participate in a survey about its recruitment of minority coaches. We know from the Confederate flag controversy that the BCA has the NCAA's ear.
It's quite obvious that even the status of an NCAA "model institution" can change nearly overnight. That's why I think NCAA members are willing to turn a blind eye to an Executive Committee decree with which they mostly agree. However, they're smart enough to know that voting on legislation to skewer other members is an invitation to open the floodgates.
There's Stanford's misbehaving tree and band, Iowa's sexist pink vistor's locker room, Wisconsin's band of hazers, anti-Semitism at SCSU, age discrimination at NDSU and Miami's gangsta football team. All NCAA members know that they have skeletons in their closet and potential "social justice" problems on the horizon. The membership is willing to give the Executive Committee just enough freedom to do what they're not foolish enough to do themselves because of the boomerang effect.
If they lose in court, so what? Look at how many schools they've forced to change their names. And they can tell the tribes, "Hey. We tried and we accomplished something."