I would like to see the following happen First before a 5th gate is considered,
Magic Kingdom:
Finish the Glalatic City theme for Tomorrowland, and add a New E-Ticket where the Speedway is, Rip out Stitch and Monsters Inc, put back Alien Encounter, and make a new experience in the Monsters Area.
Fantasyland is getting done, however, the tents in Original Fantasyland should get a remake (DL FL84)
Liberty Square is just fine IMO,
Frontierland is basically good, Its got a low level attraction (CBJ), and then 2 of the parks main mountains, BTMRR just got a refurb, so lets get Splash a lenghty refurb.
Adventureland needs to get rid of the middle eastern aspect, and restore it to its original look, however, a new E-Ticket could be brought over here. Regarding the Aladdin Spinner, Take it out, but refresh it (you'll see later in my post).
Epcot:
Finish SpaceShips Earths decent.
Universe of Energy needs updated information, take out the Ellen aspect, and return it to its original glory.
WoL pavallion should be made into a Weather Pavallion, Body Wars can be turned into a plane flight into a Hurricane that goes wrong, Cranium Command can be turned into a twister-type experience, and the open space in the pavallion can be Weather-Based.
Mission Space IMO is alright.
Test Track is currently getting redone, so Ill base my judgement when it returns.
The Oddysse(spelling is wrong) can be turned into either a new ride, or reopen it.
Imagination needs to just simply be gutted, and returned to its 82 glory.
The land could get a new show where the Circle of Life Show is, Living with the Land is fine IMO, Soarin could get updated Tech, and a new film (soarin over the world)
The Seas is ok IMO, But it would be nice if it went back to its orignal glory.
World Showcase needs to see a couple new countrys, one with a Major E-Ticket, and the other with a minor ride.
Disney's Hollywood Studios: God, where do I begin?
Fantasmic could get a new scene to replace Pocchauntus(Again, Cant spell)
Get rid of that god forsaken Hat.
GMR can get a update, say a new scene based on a newer movie?
Take out the Indiana Show, and make it the Indiana Ride from Disneyland.
Take out American Idol, and use that space combined with the former Sounds Dangerous building, to make a brand new ride (starwars themed?)
Streets of America could get some shows back there, and street mo sphere entertainment (citizens of America reference)?
Expand the Pixar Palace into the LMA and Backlot (RSR, Monsters Inc Ride, Ect)
In the Animation Area, the Aladdin Spinner from MK could get put here, and have a Mini-Aladdin Area around it.
As far as Parades, The current parade is just a big joke, it needs to be redone into something like Pixar Play Parade (DCA), and as far as nighttime, Run Fantasmic, but also try to find a way to make Fireworks happen more often (Rock the Night Fireworks).
Disney's Animal Kingdom:
The entrance is ok, ToL needs a Major Refurb.
Dinorama needs to be banished, and made into a Dinosaur-type E-Ticket, and Dinosaur returned to its glory as CTX, and the Theatre in the Wild can be turned into a Dark Ride for Dinosaurs.
Everest needs to go down for a refurb, just to get rid of the Infamous Disco Party.
Khali is ok (dont do it)
Rafikis can be connected by a new land themed to Australia would be nice, and rerouting the Wildlife Express to go around the Animal Kingdom permitter.
FotLK should be in Africa.
Avatar is said to be going where CMM is.
Once all this is done, then maybe a 5th park is good, however, 4 is more than enough.