Maybe I’m old school, but I find it impossible to get too excited about much beyond the Skywalker Saga.
I still frame it the old way: things that have “Episode __” in the title are ‘Star Wars’ proper, and everything else is Expanded Universe and may or may not be steamrolled at any time. That’s remained true in recent years despite official denial. Fight me.
So now that the grande finale of Episode IX has graced us, all there is to do with the rest of time is generate endless amounts of EU material, the equivalent of a mountain of paperback novels despite the form factor or cost to produce.
Worlds serve stories, and once the story is told the world goes away. To set something else in the same world is merely to craft a similar world for a new story.
I have no idea how they can make more Star Wars movies. I guess they can tell smaller stories set in the universe and break out of the episode format, which like you said, is the equivalent of cinematic EU. But even then, what can they do? Introduce new villains that are unrelated to the empire or the dark side? It just seems no matter what they do, it won’t feel like Star Wars. It’s not that I want to see them do the same things over and over again, I just feel like Star Wars has a limit on how many movies you can squeeze out of it. They’ve already gone as big as you can possibly go. It’s not even like this is unique to Star Wars. I think it’s only really possible to make two good Terminator movies, for example.