I still remember Orlando Thrill park which I was so amped up about. That neighborhood shut those plans down.
However, with the extension of Grand National Drive does help with the logistical nightmare of the North I Drive Area. I would love to see a new theme park here in Orlando, but I think it would be over-saturation of this park doesn't offer something one cannot get at the current local parks (Such as really tall coasters and extreme thrill rides).
Oh the current lot of the Artegon (Which I still refer to as Festival Bay), I can see another Hotel with convention space, especially with the mall across the street.