This partnership has nothing to do with splitting from the NCAA and everything to do with the NIL fiasco. That Tennessee judge just lifted all of the plastic handcuffs the NCAA had used to slow the steamroller down. Now it's been unleashed. B1G and SEC are looking at how to deal with this unspoken professional development program. Combine it with the Dartmouth NLRB decision stating student athletes are employees of the university, which no university wants, and you've got the basis for arms distance university affiliation, if not ownership of a minor league team for sports.
Should that NLRB be upheld under court appeal, you'll almost all small schools erase their contact sport athletic programs. They won't want to be paying someone (wouldn't even have to be a graduate) lifetime work comp medical and disability benefits and open up the full employee benefits package to the student participants.
Just hope Congress adopts some kind of an amateur sports law that prevents students designated as employees of the university that can pass muster in the courts.