It would be a lot more than a few millions of they released the OUT in Bluray or 4k. It’s something most fans want
Most fans, regular ones that make billions, go see the films and that is it.
Considering that they still make huge amounts of money from every re-release of the OT having the OUT on Blu-Ray would be much bigger deal and would bring in a bigger yield based on that alone. Even some of the more casual fans would pick them up because of the novelty of having an important piece of cinematic history in high definition for the first time.