No major regional operator will open up a regular park right in the heart of the tourist corridor, IMO. It would be nice to have, yes, but they don't want the direct competition and comparison of the major theme parks. The only possible exception I could see would be Herschend with a more highly themed, boutique kind of park (think more like a hotel/shopping center with some rides as an additional draw). Cedar Fair and Six Flags would be more likely and fare much better to look at a park in a spot like the I-75/Turnpike merge in the Ocala area, or possibly down around Yeehaw Junction if they really want to draw from the Miami metro as well as Central Florida, assuming some residential development were to happen before/in conjunction with that.
At this point, I expect Cinemark to move out after they completely refurb the CityWalk theater, and everything except BassPro will end up demolished. The future of the land at that point will be more wide open. Pipe dream development for me would be the Outlets moving across the road and filling the Artegon building, as the parking and traffic flow situation would be much better, I think, but that will never happen.