We just had this same conversation in the Rogue One spoilers thread. I believe Fox/Disney will be able to make a deal in the future based on the deals they’ve already made to distribute the 2011 cut of the original film.
I don’t think that the distribution of the movies themselves is the problem, it’s just whether or not Disney/Lucasfilm would want to spend the money to restore the OT when they won’t be getting the full cut of the profits. Fox would actually have an interest in paying for the restoration of Star Wars while Disney has more interest in restoring Empire and Jedi.