Six Flags DID have a park in South Florida. It was a water park located in Dania Beach called Atlantis: The Water Kingdom. As a kid growing up not far from that area, I practically lived at that park during the summers. While it did have financial issues, the park was booming during the summer times. The biggest reason why the park closed was Hurricane Andrew's wrath. The destruction from the storm was too great, and therefore it never re-opened. Damn shame.
On the topic at hand, I seriously hope this news never comes to fruition. Seeing how Comcast has invested in Universal, I wouldn't mind seeing them buying out SeaWorld Parks, but please NO Six Flags!