For Disney, the idea of ‘everything matters’ outweighs restoring the OT to it’s original release cut. Disney wants everything to ‘fit’ both stylistically and in effects. I would wager they would be more interested in updating the SE SFX to fit in with Rogue One than from removing the SE changes. In fact, I bet they have a higher priority on making changes to the PT than working on a OUT. The SE is the canon they operate around now.
The only thing that makes the OUT seem likely is the preservation Disney is doing on the original footage. Archiving the OT gives them the opportunity, but I doubt they will spend any extra money or effort on putting the original cut back together.
Maybe they would spend the money to redo the SE’s cgi, but it would be expensive and the '97 shots look “good enough” so I don’t think they’d bother.
They’re not going to redo the cgi every twenty years so it matches the quality of the newest Star Wars movies. If anything there seems to be a conscious effort in TFA and RO to replicate via cgi the look of the model work from the OT.