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If that is your premise then there is no point in discussing further. You are missing a lot.
BTW if no schools add value besides those 4, why would the B12 want any ACC teams?
No schools add more to the SEC/B1G per school payout. If they already get $75M per school. Adding two that bring in $100M dilutes the per school payout.
The Big XII and ACC are each about the same, so not sure that it would move significantly up or down. The Complaint from FSU and Clemson is that the ACC deal stinks. The ACC should be getting more. So losing those two schools might not really change the deal that much.
But a merger to try to inject some juice into all of the programs might grow the pie. Fans are routinely clamoring for regionality. This would bring it back. Bring back WVU/Pitt. Reunite the PAC-6. A Texas-centric division. A Northeast-centric division.
For ESPN, could be a quite a lot of content/inventory to control at a reasonable cost. We might not care about Stanford-Arizona... but we might care about West Virginia/Virginia Tech. Stanford fans might not care about Syracuse-Pitt, but they might care about Utah-BYU.
And maybe the presence of Miami could help UCF grow its brand.
You have to admit that Syracuse fans watching ACC football outside of Syracuse and the elite teams is down. Sure, Clemson-FSU gets some eyeballs outside of those fan bases. So does Georgia-Georgia Tech. But who is streaming NC State vs Duke beyond those fans. Well, if that is a division game with meaning, then maybe Miami, UCF, Duke, and Wake Forest fans are streaming/tuning in? So they now get more viewers just because of the division set up.
I get the B1G and SEC do not need to do this. But 12-team conferences are imperfect too, and every seemed to want to try that for a while. The B12/ACC can do its own thing as Tier 2.