I see validity in some of your points, but I think there are other considerations that make this less certain (not wrong, just less certain).
I think you are right that if (big if) FSU or Clemson comes free of the ACC, there will be pressure in the B1G and SEC to add them to make sure the other conference doesn't. That said, I think there are a number of factors that pull in the opposite direction:
- ESPN (SEC) was already paying for them through the ACC deal. They won't want to pay twice for the same team. Fox (B1G) might be more eager for a footprint in SEC territory.
- Both of these schools are a significant step down in academics from the existing members in the B1G. In that conference, the university presidents still hold much of the power. I think their response to adding either of these would be "Ewww."
- Both the B1G and the SEC are just beginning to digest the additional teams they got. I don't either is eager for more change right now (in X years, maybe?)
- I think that even FSU or Clemson would lead to REDUCED revenue per school in those two conferences, if they were added as full share members. With the number of teams they have, they don't need more inventory in general. And they really don't need more "name" teams either. There are only so many time slots for games of significance. The B1G just added a team that played in the national championship last year for half price. Why would Clemson deserve more? Those new half price members are now some of the ones voting on whether they think adding more teams (and at what price) is a good idea.
Settlement? I'd bet a pie on that. Ain't gonna be no settlement. The ACC has NO reason to settle. Drag it out, and make it hurt.