Which I fail to see how they will do so, at least in the way Potter did.
My Grandma knows who Harry Potter is. Families have planned vacations just to see WWOHP.
I fail to see that happening for this project. It's a movie that sure made a lot of money because of several factors (including the highest priced tickets ever known - Avatar has the highest dollar amount but is far, far from the highest ticket sales, the tickets simply were very expensive because of 3-D, and the gimmick factor of being the first feature movie truly conceived for digital 3-D), and it's audience was largely teenage males who had repeat attendance, who are not generally the ones who plan trips to Florida theme parks.
Sure, it looks great on paper - "#1 money making movie!" - but it's just one movie, no ancillary to speak of, relatively little merchandising, with a sequel years away that no one knows will be successful or not (since Avatar was critically panned just about everywhere except for "OHH PRETTY!" it's hard to know if people will be as taken in by the 3-D aspect that many years from now once the novelty has worn off), for all we know it could end up being "Matrix Revolutions".
In order for it to work an awful lot of things need to go in their favor, unless they truly make attractions so spectacular that they transcend fans of the franchise and are dynamite theme park attractions on their own (Spiderman, Potter, etc.). I am willing to give the benefit of the doubt until we see what they are doing, but unless Disney is finally stepping up and we aren't just going to get a bunch of video screen crap, I don't see this doing anything major in terms of driving people to Orlando in five years.