IMO, EPCOT has turned into the worse WDW park. My suggestions to make it better:
1. Bring back the original Journey into Imagination. Also, it should be plussed with modern technology.
2. Get Nemo out of the Living Seas. Build a ride similar to TDS's 20,000 Leagues Under the Sea adjacent to the Living Seas. Have this ride show us recreated (not projections or videos) wonders of the very very deep sea that we know actual exist.
3. Build an updated Horizons.
4. If Body Wars has actually closed for good, make a ride based off the same idea, only this time it isn't a simulator, you would be actually surrounded by 3 dimensional environments like a dark ride. It would be a dark ride/thrill ride combo ala Dinosaur. Have some focus on the educational aspects such as how the body works.
5. Turn Test Track into an attraction about the future of technology, let us ride in cars that will be available in the very distant future. This could be paired with an updated Worlds of Motion.
6. Make an attraction in the Energy pavillion that doesn't rely on watching videos as much.
These improvements could turn EPCOT into a great park, instead of the park for seniors. Also, World Showcase has a lot of problems, but Future World is the focus for this thread.