What would Disney have to gain from making more changes?
A 4K version of Star Wars, for one. For >2K, they absolutely must go back to film elements, which means pre-2004. Another good reason would be maintaining contractual obligations (i.e. with Reliance Media) that were agreed to prior to the Lucasfilm purchase. They may try to make the result look like the 2011SE, or the 2004SE, but if they do, it will inevitably be somewhat different and therefore "more changes". Heck, if they decide to actually go the OOT route, they may decide to port over some of the more subtle recomps from the SE, and that too would be yet another special edition. There are SO many ways this can go wrong without someone at the helm who actually loves the films deeply.
In short, the work must continue. Frankly I don't think there's anybody this can be entrusted to who isn't already here.