The ACC championship game is about image.
Specifically, its about building the football image of the ACC. The ACC Tobacco Road basketball image is thoroughly established and holds a leading place in the nationwide image of college basketball. IMO, the NC "mafia" deserves much of the credit for building that image.
But they are not likely to be the epicenter for building the football image. Thus, despite the fact that Charlotte would be an excellent host city with an excellent venue, Florida is likely to help the ACC to create the best image of the power of ACC football.
This isn't a slam against Duke, Wake, UNC or NC St. In December, it would, IMHO, provide the most impressive image of the power of ACC football to have its championship game in Florida (Jax or Orlando). IMO, this might well force UF to strongly consider jumping into the ACC. I believe the Gators will be the 12th ACC team.
IMO, the only better image of ACC football power than Miami vs FSU fighting for the ACC championship
in Jacksonville, would be Georgia Tech fighting Maryland, for example, in the championship game - having beaten both Florida schools to earn their way into the championship game.