You might be more on the nose than we know.
They cant put it on the Energy side specifically because of Guardians and the land it takes up.
They've been working on "something" backstage behind and adjacent to Seas for a few months and no one (in our realm) knows what they're doing. If they built over the bus loop or adjacent to it, that'd be an interesting place to access the park.
Also, just for funsies, for whatever reason WDI designed signage/directionals for the Skyliner for Epcot's front entrance. If it will ever be used, as in the Skyliner was possibly going to go there or may in the future, dunno.