They're pretty land-locked, though. With the TTC, golf course, Grand Floridian, and lake surrounding it on all sides. I doubt they would take away too many more hotel rooms to convert them to DVC, so they would have to build new. They could maybe sneak one building in somewhere, but if it were to stay to Poly theming, it could only be 3 stories tall. Seems like a lot of effort for what would amount to basically 12-30 2-bedroom units.
Also, wasn't there something about zoning restrictions that kept them to only studios, limited to one toilet? I know that they wanted to put in 2 toilets, but were prevented from doing so. I would be willing to bet those same restrictions would keep them from building new buildings.