People always mention the idea of dissolving conferences, but they generally have a disinterested party clause that means that the other schools can declare another school disinterested if they are trying to leave and then they do not get to vote on whether to dissolve the conference. Even if you somehow got eight teams to want to dissolve the conference (and that alone seems pretty far-fetched), you'd somehow need to make sure the other schools did not suspect any of them were trying to leave, which would be difficult to do if they are calling for a vote on dissolution.
Just for fun, let's say they can do it (or the ACC doesn't have a disinterested parties clause), who are the eight schools? Obviously (1) Clemson and (2) FSU. Then (3) UNC and (4) UVA seem like the most talked about. I guess after that it would be (5) Miami? Although that seems like it would only happen if FSU goes to the SEC and the Big Ten desperately wants into Florida. For the last three, maybe (6) VaTech, (7) NCState, and (8) Pitt?