They essentially over the years have rebuilt Epcot. You need look no further than the park that is today to see what they would do if they built Epcot fresh. Just imagine Future World without the preexisting structure and remnants of former versions of the attractions. Test Track was pretty much a new attraction not that long ago and they seem to be using the ride technology currently so it's safe to say a new Epcot would include TT, they just wouldn't need such a large building for it. Mission Space is a fairly recent addition and built new from the ground up. I think it's a safe bet as well probably with very few changes. Obviously they wouldn't want WoL, they have it sitting there and CHOOSE not to operate it. UoE is basically an overlay on the original. I don't think they would include an energy attraction now days maybe just some interactive energy exhibits with corporate sponsorship. As for Imagination again this was rebuilt pretty much, just within the shell of the former attraction. The key points I would take away from this is less figment less ride. I think it would be a significantly scaled down pavilion, maybe just a small exhibit. The Land served an opportunity to clone an attraction from elsewhere, I think the Epcot built today would likely have several such cloned attractions. The Seas again was pretty much a complete redo. They wouldn't need the big fish tank obviously, I think the seas pavilion would be more like the Little Mermaid in FL a small dark ride, maybe a turtle talk show next to it. SSE seems to have been their biggest obstacle. It's in the entrance, it's an icon, and it's difficult to change whats inside. If you look at what they have changed though the emphasis has been on interactive exhibits and games. I think elements of SSE would simply be incorporated into a much larger inovention/merchandise area that would serve as the focal point of the park. As for WS I don't think they would put this in the park, I think they would maybe build that as a shopping dining area and take whatever direction the tenants chose on that area.