I do see what you are saying. In my opinion, Disney has been building so many resorts, as well as expanding the ones that they have, without really adding to the amusement experience. The parks have stayed the same size and had relatively the same number of attractions. Unfortunately, with more hotels, this means more people are coming to Disney World. With more people in parks with the same number of attractions, you have much larger crowds. My solution was to build more parks with more attractions. The idea of creating more attractions in the existing parks is also a very valid idea.
Personally, I feel that Animal Kingdom has the most room to grow. I wish they would change the name of Dinoland to Pangaea. A simple change, yes, but I feel it would be an excellent one that would expand the education that you can receive at Disney. I would love for them to add in an Australia land, as well as and Antarctica area. Australia could really do some great things with Finding Nemo
(hello EAC ride!) and I think people would really love the addition of kangaroos, koalas, wallabys, Tasmanian devils, etc. Antarctica could have a great bobsled ride (maybe something similar to the matterhorn, even and yes, I know that the matterhorn is not Antarctica). I think people would love to see the penguins, as well. Disney advertises that Animal Kingdom is Nahtazu, but I think that that idea is wrong. Disney is known for doing everything better than other parks. Animal Kingdom needs to be the same. RAther than it not being a zoo, it needs to be "Disney Does a Zoo!" With their resources, they could make Sea World and Busch Gardens look Bush league.
I don't know what they are doing with Hollywood Studios. I feel that it needs to really embrace the whole "A Hollywood that never was and always will be" mentality. I think you need to feel like you are walking around the idea of the golden age of Hollywood when you are walking the streets. Sunset Blvd and Hollywood blvd do a wonderful job of this (especially before that horrible hat was constructed that blocks the chinese theater). But then I feel like the rides and attractions need to also embody this mentality, or make you feel like you are in the movie somehow. Indiana Jones, Lights Motor Action, Tower of Terror, and even Great Movie Ride are able to do this. Rock N Roller Coaster fits to a lesser degree. Backlot Tour worked before they decided to royally screw it up. But then you have other things that don't seem to fit. Toy Story Midway Mania is one of these. I'm not really sure where it would fit, though. I guess you could move it to MK in Fantasyland, but I'm not sure it really fits there. Plus there is the problem of DHS not really having enough attractions as is.
Wow, I am rambling and off topic. In any case, I am sure that the picture isn't showing a fifth gate, but if it was, I would love for it to be a Pixar Park for all of our favorite Pixar characters, or a Marvel themed area with many thrill rides. And as long as they are going to have the contractors in, maybe they can make some of the changes that I want in the other parks