I always find one factor in this discussion interesting...
When bringing up the troubles of Canadian franchises a couple decades ago, its always said that much of that was due to the fall of the Canadian dollar. I certainly agree that economic conditions can play a huge part in overall health of a franchise.
Which is why I find it somewhat odd that the worst cycle since the great depression is never mentioned when talking about this. From 2008-2010 (the years leading up to the 2011 move), Atlanta lost over 184,000 jobs including the worst overall year in decades, 2009 when over 136,000 jobs were lost alone. The real estate market was the worst in the country as over 5 million square feet of office space delivered during that same timeframe. And with that, the residential housing market crashed as well.
Since then, Atlanta has gained back over 400,000 jobs and has landed the HQ's (or major hubs) for Porsche, Mercedes, State Farm, GE, Honeywell, and just announced a $42 billion data center/office commitment from Facebook and Anthem is building their hub (rumors of this being their new HQ) now. Atlanta is now the #3 city in numbers of HQ's.
Just a thought. In no way does this mean Atlanta gets another shot (Houston is still a bigger market for example), but this certainly helps.