I don't know if UNC would be interested or not, but if guessing would say they weren't. VT on the other hand can't unless the state of Virginia changes their legislation. When the ACC was expanded and the Big East was falling apart, VT was going to be left out of ACC expansion, Virginia Legislature passed a law/directive that the 2 schools had to be in the same athletic conference. So Virginia decided it was better to bring VT into the ACC than to join them in the failing, football wise, Big East. So if VT comes, Virginia will be coming with them. It's basically the same with OU and OSU, their state legislature has tied them together in the same conference.