Maybe this is my rose-colored glasses but I think Star Wars will not have trouble enduring. The original Star Tours ride opened in DL in 86 and it’s still a solid ride.
Yes, Solo was a let down but I’d argue that the newest trilogy is far better than the prequels. Not to mention all of the books, comics, cartoons, video games, etc. all set in the Star Wars universe.
I’d argue that Pandora is a much larger long-term risk than SW.
The original trilogy will be timeless, but it's the new films that will be toss-ups as to their longevity. I agree about Pandora. I'm not sure that film, despite the $$ it made, will be something people clamor for in the future. I, personally, thought the movie was very lackluster and almost walked out, so I was in no rush to head to a land based on a mediocre movie. And to be clear, it's only one movie....an entire land based on one movie. I know the sequels are 'coming' but James Cameron has been saying that for five years lol