Spoiler laced ponderings follow. Beware.
Many Disney films start with the film’s princess’ parent(s) death and that drives the story. We got that with Rogue One. I know it is a classic story telling device, but Disney are masters.
Now that we have seen Vader’s castle, how long until we see it at the center of a Star Wars-land at one of the theme parks? The land going into Studios at Disney World is an add on, but there has been talk of a standalone Star Wars park at another property for a while.