With all of the work being done at Epcot right now, I understand them not wanting to close down another attraction, when the park is starved for attractions as it is.
Assuming Spaceship Earth is the next refurb (I mean it is featured as such in the Epcot Experience), I don’t see an Imagination rehab occurring until at least both Guardians & Play pavilion are open.
Heck, I doubt Spaceship Earth goes down until at least Ratatouille and the Moana walkthrough are ready and they can claim “water” as an “attraction”.