I think a lot of the growth and sustainability has to do with the amount of corporate HQs and jobs in the area. Coca Cola Bottling, Lending Tree, National Gypsum, Nucor are all HQ there. I think the short commutes to Uptown and to Ballantyne helps a lot also, most people that I know that live in the area either work in there, or in one of those areas.
The surrounding neighborhoods seem to finally start working together in the form of SPAN. They have some interesting ideas and projects, I think they one that was approved will be similar to the Culture Loop in Indy, which is very cool. They used CIP bonds for funding, but in the future, I don't think turning the area into a MSD would be a bad idea. I put a link to the other projects they've been floating below.
https://charlottenc.gov/charlottefuture/CIP/CNIP/Documents/SouthPark-Proposed-Projects.pdf