It's not that simple. Each change made will necessarily send out reverberations affecting the entire conference. Other than VT and UVA trading annual cross-divisional rivals, so that UVA plays BC and VT plays the UofL, all changes will irritate several other members of the conference, perhaps enough to lead to major trouble.Florida State wouldn't complain if this switch was made. They want more games with Georgia Tech. This switch wouldn't hurt anyone really as Georgia Tech-Louisville would give the ACC a new good rivalry, Virginia Tech-Clemson would be played annually and give ESPN a good TV game, UVA-BC would be played annually, and I mean UNC, Duke would get Louisville annually instead of Georgia Tech wouldn't be that huge a hit.
I get our UNC friends saying its unlikely, but its something to throw FSU a bone if possible it wouldn't kill divisional balance as Louisville is suppose to be a good football team replacing a good football team in Georgia Tech.
UNC, for example, has a fairly large alumni base in and near Atlanta. When Bobby Dodd has 55,000 to see UNC play GT, you can bet that at least 6000 are UNC fans. UNC does not have a large alumni base in Louisville. Add to that the fact that GA turns out the 4th most football talent in the country while KY turns out less than TN, which turns out less than SC, which turns out less than NC or VA, and it is a given that UNC would never vote for such a trade.
We are stuck with the divisions we have until we can scrap divisions.