The only reason I don't see the Marvel gravy train stopping is because 1. Fans got spoiled and 2. They have two of the more popular properties waiting in their back pocket. DC started pushing out shyt with their most popular characters expecting the fans to flock just because. And as we've seen, a lot of those actors are fed up with the studio. Never makes a good sign.
Like someone alluded to earlier, the movie theater model is trying to recover by either waiting months for these movies to drop via streaming, or even adding a premium fee to watch said movie. I don't think they realize that people are patient enough to wait, especially if they're not providing the visual effects you can only catch in the theaters. I enjoyed Black Adam, but if people don't want to watch it, it's a multitude of factors. The action/thriller genre in general I feel like is about to take a big hit. I love them shyts, especially if they're 2:15 and under. But, to a lot of people they feel like once you've one, you've seen them all.