Oh, for sure, it's definitely still in the hypothetical stage, and may never develop beyond that.
But, I would never say never given how significant of a revenue-enhancer that sort of thing has proven to be across professional sports, and the fact that teams will always be looking to maximize their revenue streams. Attanasio's goal is to make AFF a year-round entertainment destination beyond the 81 home game days. He's arguably started that with the addition of X-Golf. There will inevitably be a natural progression which may or may not culminate with the creation of an entertainment district, but it will continue to be discussed and hypothesized, probably starting with the upcoming renovations fight.
FWIW, not that they're identical situations, but the site of the Battery in Atlanta (Cobb County) wasn't anything special before the ballpark was built. God knows they have enough space surrounding AFF.