The way you would get pooling to happen is by eliminating equal revenue sharing. The big dogs get more money.
At the end of the day, what this would mean is that the actual elites would get more than everyone else, regardless of conference. The schools most adversely affected would be the lower class of the Big 10 and SEC - IE the schools that are basically Big 12 or ACC schools that are historically lucky.
Theoretically you'd have the Big 12 and ACC support this because it stops the elevation of their peer schools by association with the blue bloods, and the blue bloods are on board because they'd make more money. The Big 12 and ACC wouldn't likely make any less, but the gap between them and the artificially propped up schools in the back half of the SEC and Big 10 go away, and I think at the end of the day, that's really what the Big 12 and ACC want to see.
Any realistic person understands that Ohio State, Michigan, Texas, LSU, etc are the economic drivers of the sport and in any capitalist sense have a right to the bigger share of the pie. The pain point is seeing the Purdues, Mizzous, and Marylands of the world being rewarded at the expense of the West Virginia's, Virginia Tech's, and Kansas States of the world.
The schools who would oppose divvying revenue on the basis of actual revenue generation are outnumbered by their Big 12/ACC counterparts, and overruled by their in-conference overlords.
But at this point, no one on the "pro pooling" side of the fence is proposing such a model.