That. Just. Ain't. Happenin'. Classic line from Darrell Royal the fabled coach at Texas when asked about whether a good prospect they just signed would see significant playing time - "I can't tell you whether he will play for the University of Texas, but I can guarantee he won't play against the University of Texas."
In the 60s, the power teams would have over 100 scholarship players. The only reason that the competitive edge in college football isn't any worse than it is now is the 85-scholarship limit. Does the SEC think that folks have forgotten about the Bad Old Days? If anything changes, I could see the limit being cut to 75 to get better Title IX compliance numbers.
As far as the OP is concerned, the number of players and schools that try to go the PWO route with the Transfer Portal will be insignificant. Onesies and twosies, at most. Will somebody try it? Sure. But it's hard to see very many schools trying to do that and it's just as hard to see a player taking a huge chance like that when another school will offer him a scholarship and a better chance at significant PT.