Okay, another idea, but I'm short on details (I'm on my way to an appointment, so it'll be quick and less-detailed).
For Epcot, since they're so keen on re-doing all the Future World pavilions, I have a few ideas for this part of the park.
Okay, a replacement for Body Wars (it'd have to expand the building though) is a new version of the old classic... Adventure Thru the Human Body....old microscope and all! Actually, I didn't think this one out quite enough, because 1) that attraction left seventeen years ago and 2) I don't know what it entailed, since I myself am only 17. So I'm kind of in the dark on this one. But anyway, I'll work to the best of my knowledge. Okay, similar to the Great Movie Ride, the attraction will have four different shows, encompassing different levels of human stages: child, teenager, middle-age, and senior. This will be the rider's choice. Anyway, you'll be treated to a Pre-show, depending on your choice. These shows would contain a short film about how they live, summarized medical history, etc.. Then, you'd embark on a trip through the person you selected! For example, the middle-aged person is a smoker, so when you travel though his/her "lungs," they are black, showing off the effects of years of bad choices. Then, when the next car comes thought the same area, say, for the child, it'll look like the color of a healthy lung, but something else, like the brain of a child would be "developing," like growing before your eyes. So, it's kind of cool to think that you could go on this ride 4 times, and see the differences in stages of life. And the cars would be on the same track, so it'll save space. Also, in the beginning, you'll go through a replica of the giant microscope that was in "Adventures Thru Inner Space."
Here's another idea for that same space:
Next, a Weather pavilion. Now, we all know what ride would go in here, but for the pavilion itself, I would make giant cylinders throughout the building, showing off weather effects: rain, tornado, thunderstorms, snow, etc. I know many effects could be re-created, and I think this would be cool, so guests could walk up to them, look at them from other angles, and better understand how they happen. This is Epcot after all.
Also, take the Carousel of Progress, and put it in Epcot, as a sort of homage to Walt Disney.
Next, I'm moving on to Disney MGM Studios. They need something to replace the Honey I Shrunk The Kids play area. What I think they should do is add some kind of generic action ride, but using guest-participation. Check this out: with the newer side vehicles, like the ones used on Temple of the Forbidden Eye, they could create some crazy situations. Instead of putting you into a movie that's already been seen by guests, this will let you go into a movie that you direct and star in, AND do all your own stunts!
You sit in a car, similar to a Test Track car, but painted red, and then you'd hear someone yell "Action!" and you'd be off. You'll be chased by a car, perform all kinds of crazy jumps, turns, and even pop a wheelie! During the ride, each person in the car will be given the chance to, say, turn left or right, jump over a bridge or drive around it, use the car's "special features" to set off a stick of dynamite to evade the other car or use an oil slick, and so on. And the best part is that at the post-show of the ride is a chance to see your movie in action (using in-car cameras and pre-shot footage), and even purchase it, if you so desire.
UPDATE: I want to clarify something. In the MGM ride, the guests aren't actually popping wheelies, or making perilous jumps, or anything like that, and they're not even being chased, it's all just the Dinosaur-style ride system that simulates that stuff. They will be going fast, but they'll never leave the ground. Oh, and I would like to mention that different parts of the ride would be set to a default, like, for example, if someone doesn't make a choice, or the ride isn't full enough and they have to let empty cars go, then it'll have it's own course set already. And the setting for all this, by the way, is outside an airline hanger, with the car chase being the climax of the movie. Oh, and before you get unloaded, the "director" yells "CUT!" as a nice little homage to Hollywood. The VHS tape that you can purchase would also include the making of the whole ride itself.