Whether they do it now and share the profit with Fox or wait three years and keep it (mostly) for themselves, I think Disney will inevitably restore the original versions.
There’s no good reason for them not to do so, especially when Harmy’s version is a widely known thing.
George’s statements over the last seven years seem to indicate he really doesn’t care anymore, and the fans reconstructed the movies without his help anyway. Even he needs to face the music eventually. John Landis’ statements seem to indicate Disney has no qualms about releasing the unaltered versions either. As he said, it’s “money on the table.”
Warner Brothers spent more than a million dollars restoring North by Northwest, a movie I’m sure a restored OOT would outsell. Disney need not worry about losing money.