Solo is not a great movie but it was never going to be a great movie. It's fun and entertaining and nostalgic and I think it answers some questions (some that were maybe never really posed) without completely overdoing it. We didn't need this movie, a lot of people didn't even want this movie, but I'm glad we got it. One, because I enjoy it and I'll be happy to add it to my collection when it's available, and that's one more Star Wars movie option on those nights when I'm in a Star Wars mood (there are many, you can imagine). Two, because, as Yoda said in TLJ, "the greatest teacher, failure is", and I think it gives Lucasfilm a chance to reexamine their strategy going forward; from which movies they choose to make, to how they choose to make those movies, to even when they choose to release those movies. I think all of those issues and more will be addressed thanks, in part, to Solo.
I'm worried about Episode IX because I don't trust JJ to care enough about completing a good, memorable story. I think with JJ aesthetics and intrigue are more important than answers and satisfaction. I fear that he'll be going into IX with the same mindset he went into TFA with: fixing Star Wars. Which means it will look and feel and sound like Star Wars, but that it may be just a passable story i.e. TFA***. Only this time I don't think Star Wars needs fixing. Episode IX needs to be epic. It needs to out-epic TLJ. I don't know what that means as far as the story goes, I don't care really, that's not my job. I just know that it needs to be great, not only for the sake of completing the trilogy, but also for setting the tone for what comes next for the franchise, and reuniting the fan base, though that's likely an impossible task. But I need JJ to care about the characters he wrote and to show us exactly why these are the people he chose to carry the torch for Leia, Luke & Han. Rian Johnson didn't write those characters, but he took them where he thought they needed to go (with, I have to believe, at least some guidance or instruction from JJ).
I honestly wish Rian Johnson was doing IX. I wish he had been slated to do both movies the day they hired him to do TLJ. I think his version of the Star Wars universe and the Skywalker saga is the one I want to see, and I think it would have been much more palatable for fans if he were able to spread his story out over two movies. I'm not sure what he would have done differently, if anything at all, but I think that maybe he wouldn't have felt as though he had to accomplish all of the things he did in one movie, and maybe he would have been more willing/able to address some of the mysteries posed by JJ in TFA which, as I've stated before never really bothered me much, but seem to have been expected to be addressed in the second film of the trilogy by many, many fans.
***I want to clarify that I still love TFA. It was fun, exciting & nostalgic, it did it's job in reintroducing us to the Star Wars universe that we knew and loved before the dark times... before the PREQUELS. And I think that it was overall a really good Star Wars movie. Maybe a bit too much rehash, and maybe the posing of some unnecessary questions with no intention of answering (remains to be seen, obviously), but a good movie. And I love the new characters that were introduced. I really do want to see where they end up and how they get there and I think that between TFA and TLJ we have pretty good character arcs so far for all of them. I just hope that Episode IX is as much better than TLJ as TLJ was better than TFA. Probably unfair expectations and as we've seen that's dangerous territory these days haha. But that's where I'm currently at. Gonna be an exciting 18 months of news and speculation, I imagine.