The only reason we got the Maclunky edit was because Lucas had already paid for it and it was already done, if not converted to 3D like he wanted. Disney never paid for Special Edition 4.0’s remastering/restoration. I doubt they will pay for the original versions being redone from scratch and a new scan/ restoration when they consider the 4k master archival.
It might even be long past the time when releasing the originals would have been worth it in terms of marketing with the death of physical media on the horizon. And all but Return of the Jedi’s 40th anniversary missed. I suppose if they put a couple of million into it maybe it would be worth it as a exclusive for Disney plus, but even that seems unlikely. I think its likely they never happen at all beyond the GOUT.