Right now, a big impediment for either the Big 10 or ACC to invite us is that they really need to invite a 16th member at the same time because the current rules for a championship game require you, for practical purposes, to have an even number of members. So first the problem is you need to find two, not just one, schools that bring value, and second, the problem is even if there were two schools left that could add value, they still wouldn't be invited (unless one was Notre Dame) because it wouldn't kind of force Notre Dame into the other conference. Since none of the P5 want Notre Dame to join a someone else's conference, the Big 10 and ACC will be stuck at 14 forever ...
... unless the rules for championship games change which allow for an odd number schools. In this case, our fortunes could reversed. There would no longer be the problem of having 15 schools in a conference. Instead of avoiding inviting us so that they don't get stuck at 15 until the unlikely day when Notre Dame can be coerced into a conference, there would be competition for us as the best school left on the board in the northeast with the last spot still open for Notre Dame.
The ACC is trying to get the championship game rules amended so that an odd number would work. The decision could come as early as April.