Sure, but it's also important to remember that being in an affluent area doesn't guarantee success. You've gotta market the team, too.
The one tweet from the NHL to Atlanta guy a couple weeks ago suggests there's ~90k NHL fans within a 12mi radius of the proposed site of The Gathering. Optimally, you want to increase that number dramatically. Sure, bringing in the franchise will help, but you need an amazing marketing team who knows what they're doing. You need to be able to bring back the old fans (a challenge, since there are some who've now seen two teams leave in their lifetime and are afraid of having their hearts broken once again), get fans of other teams interested, and be able to attract first time viewers.
Whoever wins the bid here has a long road ahead and a lot of work to do. I hope they have a great marketing team in mind for exactly this challenge.