The problem with just quitting the ACC is scheduling.
We're already struggling to fill the back half of the season. B1G teams seemingly won't play us after Oct. 1, and there's no particular incentive for SEC teams to either. At least the ACC will play us in November, even if most of their teams are so soft we get no credit for it.
If we're going to do this, we probably need long-term deals with several teams, many of the most likely of whom (Clemson, BC, Syracuse and/or Pitt, Stanford, maybe Duke or Wake) are in the ACC and would face intense pressure not to play us. Or we collude with Clemson and Florida State and pull the pin on the entire stupid conference. Then those teams would gladly have us come fill their stadiums.