The area below PotC is way outside of the park. You will need to find a way to cross the train tracks. Also, notice the streets in between Adventureland and the expansion pad. That is so the parade can get to Main Street USA from Frontierland or Frontierland to Main Street USA. It's also not just the parade. That is how the trucks and cast members get to some parts of Main Street. You will need to redo that whole road. That would be a mess. For a couple of weeks or months while they are redoing that street, there would be no parade and the Emporium would probably have to be closed because that road is how they get their stuff for the gift shop! AND THAT WOULD BE A MESS!!
This expansion pad is kind of impossible. Disney would need to make a pathway from the area outside the railroad in Frontierland through the castmember area, over the "river", and to that area. For what? A restaurant and a few gift shops? And maybe a petting zoo? It's not worth it. They would have to build a path where you can't see any cast member or backstage areas. Then they have to build a bridge that looks like it was built in the frontier times. Disney can do it, but probably not in the near future. It would cost some big bucks too!
Above New Fantasyland is not really an option. They could expand It's a Small World, or create an Alice in Wonderland mini land. But then you would have to Find a path way, where you can't see any backstage or the back of buildings. Also that lake area is where they shoot up fireworks. We wouldn't want a the fireworks to be too far from the viewing area on main street or not directly behind the castle. Also you have to think, how can it be connected to Fantasyland?
These three expansion pads are probably most likely. The only thing they will have to do is connect it to the park, chop down trees, and fill the ponds. Whala! New Tomorrowland? They can add a TRON ride. This is the area I would love Magic Kingdom to focus on next. Tomorrowland. SO OUTDATED!!! They need some new rides. The last new GOOD ride in Tomorrowland is the Buzz Lightyear Space Ranger Spin Ride. Stich Encounter is awful. Tomorrowland needs a giant refurb.
Thanks for this topic! I had a lot of FUN! Hope this helped!