You should look up “Disneyfication”.
Wikipedia defines as:
(Disneyfication and similar terms) are generally used in a negative way, and they imply homogenization of consumption, merchandising, and emotional labor. They can be used more broadly to describe the processes of stripping a real place or event of its original character and repackaging it in a sanitized format. References to anything negative are removed, and the facts are watered down with the intent of making the subject more pleasant and easily grasped.
There are lots of books written on the very topic. Pretty much what will happen in this film IMO.
If you showed Rogue One to somebody seven years in the past, I don’t think they’d recognize it as a Disney movie.
I don’t think many traditional Disney movies have everybody the protagonists die in them and a pyrrhic victory.