I don't think UNC would pick you guys over the SEC. If they did that would be fine we take FSU and Clemson and call it a day but honestly, we don't need any of them and there is an argument adding teams is more trouble than it's worth.
I don't see Clemson and FSU increasing the brand more than it is but they are both capable of pulling their own financial weight and fit regionally so it makes sense but isn't a deal we have to close.
There is a scenario that probably has a 50% chance of working where 4 schools (FSU, Clemson, ND and UNC) take offers and the rest just stay together. It wouldn't be any worse than what the Big 12 has pieced together and at some point could potentially poach a few teams like West Virginia and UCF away. I'd say just two but if UNC gets a shot at moving the opportunity and money would be too great for them not to so I think they are gone if the other two are.
I'd put Notre Dame at 85% staying independent and as long as the majority of ACC schools stick together that should be very possible.