NIL, which has been driven by collectives and donors and some corporate sponsorships. True NIL is the emerging approach which will be anchored on fair market value of athletes as governed by a yet to be named clearinghouse. There will still be "conventional" NIL as well, but it all comes more and more under the governance of the universities. This will continue to change dramatically and become far more sophisticated.
One other thing that must happen is that the crummy agent model now — where some are charging 20-30% — will shrink down to something more like 3-6% which is more market rate.