In my opinion, the reason a lot of these franchises are failing, or new franchises are having issues, is because in the film world, with big budgets and big screens, directors and producers are choosing spectacle over storytelling. This is also the reason I think people were so upset with the GOT final season. Marvel has been one of the only film franchises to balance this well over the long haul, and they are basically following the TV model to do it.
With streaming TV shows and limited series, long form storytelling is really where it's at right now. You can tell a more complex, interesting story in 8-13 episodes as opposed to 90-120 minutes. People have really fallen in love with that, so the only thing to get them to the theater is spectacle, something really worth seeing on the big screen. The problem is, when you tell big stories, you lose the character moments that drive audiences to fall in love with a film. So you are trading longevity with box office numbers, and if you are a new franchise, then the word of mouth tanks any box office legs you may have had (if that makes sense).
So, I actually think the next thing in movies is exhibition of restored older films. With all these studios coming up with streaming services, they could pull some of their popular older films from the catalog, restore them (be that picture, sound, or coloring...etc.) and release them in theaters, giving a discount ticket to those that subscribe to their streaming service or something.
I also think that at some point (and I can't figure out how this would work exactly) that theaters are going to be able to screen any movie by appointment. So if you get in the mood to watch Jurassic Park, you can pay some money to see it in a theater instead of in your home (which would totally be worth it).
Other than that, I think movies (as a format) are going to be on the decline for the next several years, unless or until they can get out of the franchise rut somehow. All the good original storytelling is happening on TV these days, and ultimately, that is what audiences want. We may pay to see spectacle on the big screen, but we fall in love with characters and stories, not CGI.