I mean, DS9 wasn’t as popular as TNG back then – both in terms of ratings and fan reception. Many considered it the black sheep of the Trek family. Berman focused on Voyager. So it was chrystal clear to every fan with even half a brain that DS9 would never get a movie. Perhaps Voyager had a tiny chance but by the time it concluded its run viewership had been in steady decline, and then Nemesis tanked.