I feel that the reason we see so many "blockbuster" movies fail, and why some lower budget, less mainstream movies have become so successful (Joker, Get Out, etc) is because there is so little originality left in cinema, people are just desperate for ANY bit of it.
I mean even Joker isn't really all that original, but just because it's so DIFFERENT from what we see 99% of the time in mainstream cinema, it became so successful.
I mean honestly, what original concepts/ideas are left out there to explore? We have covered almost every genre of superheroes, sci-fi, fantasy, action, and horror. Just as an example I was watching Event Horizon recently and reminiscing how refreshing and original this felt back in 1997. But 20+ years later, even something like space horror has been done to death in almost every type of media.