It might actually be more profitable for Disney to release a new product now than in 2020. A 40th release I think is inevitable, and another repackage of the existing master would sell to new viewers, but not to folks like us.
A new product including OOT, on the other hand, would have wide appeal and justify a higher price. By 2020, I imagine we’ll be the only market, with the inevitable growth of streaming and the continued sale of the current version (at lower and lower real dollar prices) to people who wouldn’t care or notice the difference between the two products.
IIRC, the distributors cut is relatively small, and Disney would benefit more by increasing sales volume rather than waiting for the rights.