From what i hear there was no grand plan. Each movie just winged it and then the next one has to go from there like the whole thing is improvised. There was never any grand plan for who Rey’s parents were, or who Smoke was. When Episode 8 was finished they had no idea where to start with 9 - just hand it off to the next creative team and let them run with it. I know this sounds insane, but it’s apparently the reality.
I think there was plenty of desire for a Star Wars MCU, and I don’t think we had too many movies. One a year is fine, and initially it looked like they’d done great with the first movie. I’ve always thought Rogue One was a mistake - it played well with the older generation of fans who thought a Star Wars Dirty Dozen sounded like a great idea, but it’s really not what Star Wars is about and it still anchored the movies to the original trilogy. Last Jedi obviously shit all over the legacy of the original characters, and I think Solo payed a price for that.
Star Wars doesn’t feel quite like LOTR - the world itself doesn’t sell, as we have lots of sci-fi setting adventures (whereas LOTR doesn’t really have much competition). So I think going off in a new direction after episode 9 will be pretty difficult. And if they go ahead with Fett and Kenobi movies the’re doubling down on the Solo strategy. It’s important to identify that Solo didn’t fail because it was a bad movie - by all accounts it delivers what you’d expect. It fails because people just didn’t want to see it. Unlike Gar I think that’s really hard to fix - I think Star Wars and DC are both in the same place right now.