yes kids want to play and some will leave but if I am a coach at a SEC school I show the kids I want to keep the SEC domination in NFL draft picks and tell the kid to be patient.
Add in the fact SEC schools with a larger NIL budget can keep paying thousands of dollars for kids that have not gotten on the field because of what they have seen in practice vs a school like KSU will need to throw a higher NIL number based only on HS performance and/or limited on field scouting which will be very similar to Tang's gang of 2 ppg, 4 stars transfers.
I don't believe the NCAA can legally enforce a salary cap on NIL and the result is CFB starts down a path similar to the what happened with English soccer clubs but without "official" regulation.
I don't think a lot of companies will spend NIL money on players that don't see the field outside of maybe a QB. I also don't think that players will be happy practicing but not playing year after year. They could go to KSU and play 2-3 years, prove themselves, then transfer to Bama if they think that helps their NFL stock.
Loosening a bunch of restrictions will inevitably help the bigger programs with nearly unlimited resources, but I don't think this will make a massive difference. Bama/LSU/OSU/etc may hoard some talent initially but if those players don't have a clear path to the field after a year, a lot will leave.