Ultra Sun and Ultra Moon absolutely need to have a good post-game. They are in the exact same spot as they were when they made Black/White2.

They already have the majority of the region assets, so other than the few touch ups they want to do on old areas development should not take long at all. xy/oras/sm had to be created from scratch, so even though I hate to come off as one of gamefreak's butt babies they admittedly did have a bit of an excuse.

USUM don't have this excuse, they have had plenty of time to work on awesome post game features. If they don't manage to make these games great even when they can reuse almost all of sm and use it as a base, then I will have absolutely no hope for the Switch game.