I get the money angle completely, but I believe the next moves of the B1G and PAC will have to be a numbers game--as in, number of teams. I say this because it would give them legislative voting power to keep the SEC in check while still making a lot of money for their conferences. Think about playoff expansion, for example. Ohio State already put in a motion to put it on hold with this latest realignment. Three superconferences might try and keep those playoff numbers low just to screw the SEC, and they'd have the power to do it.
The goal of the SEC is to take over all of the major brands of college football, but I don't think universities like Ohio State or Michigan will ever cowtow to them. So what do you do? Save enough teams to have massive legislative power and prevent ESPN and the SEC from taking over college football entirely. This has as much to do with Fox as it does the B12. If you're the commissioner for the B1G or PAC, your job is to make sure your big dogs don't jump ship. You need to be able to say, "Oh, the SEC wants to break away from the NCAA? Go for it. We have 34 power conference teams in the west plus independents and midmajors. We still have the real national championship. Have fun with your 20 team semi pro league." You can't make this threat if you play the poach game because you'll kill the PAC/B1G alliance. The B12 doesn't count. It's as good as dead. If you don't give the majority of those teams a home between the B1G and PAC, you risk losing the big brands to the SEC and putting everyone else out to pasture.
What needs to happen is a three year plan between the PAC and B1G with the remaining B12 schools. We would make that realignment happen in 2025 so UT and OU have to make the maximum payout to the Angry Eight if/when they leave early. If the B12 falls apart before then, there won't be a penalty for UT and OU.