None of these scenarios make sense.
Everything I run through my head hits a brick wall.
UNC, FSU, Clemson and UVA are a block and somehow "get out" of the GOR. The only way out of the GOR is through litigation. No conference is going to take on a new member until that litigation is concluded. I don't really know contract law, but I know that courts do not like to void contracts. So I doubt it's really possible without a significant payment.
So say they get to that point. Either B1G or SEC. Why is ESPN going to pay them more money in the SEC? Why would ESPN not fight for the GOR to the death to stop a significant asset from going to Fox/NBC?
Realistically, the B1G is not an option for this scenario. So the SEC - presumably then ESPN would be colluding to destroy the ACC and pick off its 4 preferred members to the SEC, thereby strengthening the SEC and ESPN would save a ton of money on the ACC's dissolution or breakdown of the GOR.
If that was the case I imagine the remaining ACC, whatever that looks like (us, BC, Wake, Georgia Tech, SMU & Calford?) would have a cause of action to sue ESPN, the SEC and the colluding former ACC schools.
I'd love for someone who knows more to explain better, but that scenario sounds very illegal.