On a long enough timeline, the unaltered versions get restored by Disney simply because they run out of ways to keep repackaging and reselling the same movies again and again without including them.
Agreed. I doubt Disney would release them out of the goodness of their hearts (although they’d market it as such), but rather because they’ve just about killed the golden goose.
As noted, the 50th anniversary is probably the soonest we can realistically hope for a formal release, but even then I doubt they’d spend much time on properly restoring it.