What Gene DeFilippo said is true. He didn't want to add UConn because he didn't want another team in New England. The Tobacco Road basketball schools wanted UConn, and Duke chaired the Council of Presidents. The Big XII was flirting with Pittsburgh. ESPN was telling the ACC to take Pittsburgh and West Virginia according to some sources. That wasn't going to happen because there was a 35 year quest to get Syracuse. IMO they could have brought in everybody they wanted, but the ESPN contract gets reopened at just adding 2, and its easier to extract more with small steps than with Big Ones.
There has been this ulterior motive of courting Notre Dame by the ACC all along. It goes back to Gene Corrigan, who was the ACC Comissioner at one time and also the AD at Notre Dame and UVA in his career. Kevin White, AD at Duke, wants Notre Dame - former AD at Notre Dame. Nathan Hatch, President of Wake Forest - former Provost at Notre Dame. Mary Anne Fox, Former Chancellor of NC State, BS - Chemistry, Notre Dame & Notre Dame Trustee. And there are several more.
The additions of Boston College and Pittsburgh were made in part to make the ACC more attractive to Notre Dame football. It wasn't the ONLY reason, but it was a secondary reason. And there is a part of the league heavily considering adding the US Naval Academy too. Notre Dame football likes them. The problem there is while Navy would be nice for Notre Dame football, the ACC runs 25 sports including Basketball. Navy is not a fit for basketball. The ACC is 5/8 of the way there.
We know that there is still support for UConn in much of the conference. Perhaps if the NCAA lets the ACC have flexibility with the Championship Game, it could open an opportunity to just add one. ESPN would have to pay more though, or it would have to help launch a network in new areas.