or Miami to the SEC and UNC and UVa the B10. PAC will stay the same. ND may have to change alliances with the B10 and B12 may be able to snag a leftover non-snobby ACC team (the FSU/Miami leftover, NCSt., GT...).
ESPN may be able to save the ACC, but they won't if they have enough invested in the B10 and SEC.
Note: I don't think it is happening soon, but eventually will.