So Disney would have to go to an even older, worse condition film and do a complete remaster from whatever state that's in after another 30 years of degradation.
I have an entire book about the lengths Disney went to in order to find and restore all the old Oswald the Lucky Rabbit cartoons when they got the rights back. And the return on investment was basically zero. They just did it because they wanted to. I think they'd actually love to work on restoring the theatrical releases. Plus it would sell 10 million more copies than an Oswald collection ever would.
They'd put top men on it. TOP MEN.