As long as Disney isn't too greedy and agrees to a fair sharing of profits, I can see Fox playing ball and doing a OOT release. Disney needs to generate good will for Star Wars after the last decade of Prequel-only attention. Fox will have only so long to get money from Star Wars. Do it.
Just get rid of the awful Lowry restoration and use the GL Technicolor print as a color source, it should be good. Disney and Fox know what the fans want, and they want happy fans for 2015.