Long post ahead
1-Add the "sky" pavillion between the land and the Living Seas. Give it a ride with the track above, and your legs dangliong free. No loops or anything. Start the ride off just like Orville and wilbers first flight, then go through the history of flight, followed by a flight over various cities and whatnot. All the while toting the freedom that aviation has brought us.
2-The living seas. Turn the tubes into a boat ride. Start off on the "sea, during a nighttime storm out at sea. Then, the boat would go down a slight drop, into the tube system below the waters, emphasizing the beauty and tranquility, and amazing forms of life that are under what seems to be a scary, threatening ocean.
3-The land, leave it alone, Soaring will be enough.
4-Jiyi-Redo it again. Make the ride system better than the original, but be more creative with the sets.
5-Test track- Leave it alone, but add another ride like World of Motion. The engineering of a car is nothing without knowing where they came from. Hell, just bring back World of Motion, attach it to Test Track.
6-Mission Space. Its fine on its own, maybe after you exit the pods you could be on mars though, with more stuff, even another ride to do. It needs to be more of a pvaillion I think.
7-Universe of Energy--I dont know, but htis ride has lost its edge. Maybe make a pavillion dedicated to the arts or something.
8-Wonders of Life-keep cranium command. Get rid of body wars. Add a Imax theatre. Do a presentation that makes you aware of your senses. A big movie, great sound. Blackness with sound , then vivid images with no sound. Sort of sensory overload, followed by sensory deprevation. Explain how and why they work. Keep the big pavillion with all the little stuff to do. I think all pavillions should have a lot of hands on stuff.
9-Spaceship Earth-Keep it an educational ride. But make it go over major points that have made us, earth, etc the way that we are. Cover the arts, music. Cover communication. Cover the great minds that have helped us along. Cover civilizations lost. Cover war and peace, and carry us into today. At the end, at the very top of the sphere as you embark backwards, have Mickey saying "Gee, its a wonderful place we live in, wouldnt ya say?"
10-add a new country or two and a few more informative rides to World showcase. Make rides that take us to these countries.
This is all a huge long shot, But its nice to dream, isnt it?