Have you any clue the time and effort a proper restoration of 40 year-old film elements would take, especially in the condition in which they supposedly exist for Star Wars? It is completely understandable that the future of the Saga (i.e., making sequels) was given precedence over the old given Disney’s massive investment in the project and the equally massive, all but guaranteed payoff of making new movies. What would be in the eyes of a casual fan “just another DVD release” isn’t going to be nearly as huge a revenue stream.
Keep in mind TN1’s restoration took 3 years and that wasnt the original negative!!