It is arguable whether it is a minor concern. I know I feel it would be quite a shame if it was taken out. Either way, it is definitely at least a valid concern, as Disney has already done it once with their digital downloads of all the films but Star Wars “Episode IV: A New Hope” (as they like to call it), as that is Fox’s property still. They could well do it again, which would be very sad, since that’d still be them altering our perception of history, Fox was the only studio that went out on a limb to produce Star Wars, sure they wouldn’t be putting out the home video version of it (well, I suppose this concern only would take hold after 2020), but their important role in making the original films should not be diminished because ownership changed hands 30 - 40 years later. If Disney ends up wanting to mess with the opening credit, they they should do their own logo first, followed by Fox’s logo with fanfare, then the untouched movie.

Again, if projects like this force their hand early, before all the rights change over, then the question of Fox fanfare inclusion would likely be moot with Fox handling the physical distribution.