I would say 50%+ of AU alums leave the state after graduation and go live somewhere else (the state of alabama doesn't have much going for it except Auburn University and Gulf Shores / Orange Beach). When Cam won the heisman there were hundreds of AU fans there and I am sure many are residents. Since I graduated, I have lived in Atlanta, Houston, Miami, and Boca Raton (FL) and spent a couple of summers in Orange Beach.
AU fans needed a franchise to get behind. The Falcons have always been it, but only because it is an hour and a half from AU. There are literally tens of thousands of new Panther fans from the AU fan base easily. And AU fans are pretty passionate and loyal. I'm all Panthers now regardless of how Cam does though I expect he will be successful. With all the crap AU fans and Cam had to put up with last year, I am fired up to see him do well in the NFL and shut the haters up for good (and there are a LOT of them with big mouths, but dumb as hell).