As always, restoring the film is pocket change compared to what is spent on other Disney properties. Lucas was the only one saying it would be costly, because he never wanted to do it in the first place. Disney has spent money on restoring Song Of The South, and that will be released on video when Walt’s head is defrosted. They’ll make their money back on a OOT restoration.
Lucas sold the moisture farm to Disney and essentially retired. What wrathful act is he going to do if the OOT was released? TP Disneyland?
And imagine being the guy who ran the negative through that chemical bath! Not sure I could live with myself if I’d partially destroyed Star Wars. I felt guilty tossing a silent B&W Ken Films SW reel my old projector chewed up. 😉