The biggest issue the ACC faces is they have four schools in one TV market. While it is a big TV market ESPN only wants to pay for it once. The reality is the cable subscriber penetration would be the same if there was only UNC in North Carolina. This same issue effects the B1G which is why they will not add a second school from a state. It is also why the SEC doesn't want FSU or Clemson.
Unless the ACC come up with a method of capturing value from all of the NC schools they are fighting with one arm behind their back.