Alas, the original ride will never return. It was glorious, creative, entertaining, and memorable, but the Powers-that-Be at the time decided that the interest in the ride had waned to the point whereby it had to go. It wasn't a simple retheming, the whole bottom part of the building was altered, with the all-important turntable removed. That terrible replacement "attraction" was one of the first entries of IP into EPCOT (the Flubber reference and Honey, I Shrunk the Kids) and should have been a bellwether of things to come. Alas, those of us who were devotees of the original EPCOT Center had no idea that it was the beginning of the end for our beloved Future World.
I was 12 when we went to EPCOT Center in 1984 and the Imagination pavilion is the thing that I remember most fondly. We waited for what must have been over an hour just to get into the building, where the queue wrapped around the entire lobby. The jumping fountains, the mural in the lobby, the promise of high-tech delights waiting upstairs in the ImageWorks; all of it paled in comparison to my experience when I actually got on the ride. I fell in love with Dreamfinder and Figment. To me, they were instant classic characters. I only got to experience the ride two more times, since a Disney vacation wasn't something we could afford on a regular basis. I rode it once as a teenager (and still loved it) and one last time as an adult on my honeymoon. Just three times. Since there was no such thing as the Internet (the Web was still primitive the last time I rode it in early 1997), all I had to keep my love for it going were my memories and a few photos in books. Then suddenly it was gone. I'm glad for the videos that are online.
In any case, at this point I'm fine with Inside Out taking over. My EPCOT is gone. Hopefully, it will consist of something tangible and physical, rather than screen-based, but screens are cheap and Disney seems to be going all-in on them.
Sorry for the rant. I'm old and original EPCOT was important to me throughout my formative years. At least we still have Spaceship Earth for now.