@Tom You have to understand the business model argument for a fifth park.
First of all, new rides at existing parks do not bring in new revenue dollars. They do, however, keep attendance numbers up and keeps the numbers from, otherwise, going down. New parks increase revenue by offering an incentive for families to stay longer, thus increasing not only ticket sales, but hotel stays, food sales, etc. It also gets people to cancel any plans they might have had to go to USO or SW. Also, understand Las Vegas as a business model. Any where else in the nation, two, three, or four huge themed gambling resorts would be in excess. But Vegas has many more than that. It's because people think of Vegas when they consider going somewhere for themed gambling resorts. WDW, or Orlando in general, is becoming the Vegas of themed resorts and theme parks. As of now, people consider many cities for theme park vacations, including Anaheim and even Dubia. If Orlando had one of each and then some, they would consider Orlando first and rarely anywhere else. This means Orlando would need the capacity to hold all these people who would have gone elsewhere, which means they need more theme parks to handle it all. It's a sustainable cycle. More variety equals more tourists, more tourists equals a greater need for more capacity, more capacity equals more variety.
