If the NCAA could see what NIL would do, I doubt they would have changed the transfer rule. The NCAA is not going to touch NIL without Congress' blessing. Too afraid of treble damages in court.
But, they can still control the transfer portal. They should return to the old rule of sitting out a year. No exceptions. Bag men are going to be much less likely to pay 6 figures for a guy that cannot help for another 2 years. It would slow down this insanity and bring back some level of stability to MBB and FB. The schools with the deepest pockets poaching talent from lesser schools with impunity is bad for the sport, whether Iowa is the poacher or the poachee.