Regardless where they go, I think not being in a city where a school is located is important. So therefore ATL is ruled out in my opinion.
As far as Greensboro goes, I think they'll be back, and often. Look at capacity alone. GBO holds 23,500 people. That's 4k more than the Barclays Center in NYC, 3k more than the Spectrum Center in Charlotte, over 5k more than the Omni in Atlanta, and 3k more than the Cap Center in DC.
And it's still central in the conference. It ain't going away as a venue any time soon.
Q "Why do you like Duke, you didn't even go there." A "Because my art school didn't have a basketball team."