It's hard not to be cynical or entertain thoughts of Hollywood planning these things in case the show sucks. Because they can clearly do entertainment with diverse casting, non-white people, female leads and succeed:
- Tom Holland Spider-Man does not have a red-head MJ, Flash is Indian and the made up best friend is Filipino.
- Domino in the Dead Pool movies is black. NTW doesn't seem to have the same powers and is gay. But I'm not sure what the current character status is.
- Everything Everywhere All at Once
- Black Panther
- Shang Chi
- Jordan Peele does good work: Nope, Us, Candy Man, Get Out
- The Expanse
- Life of Pi
- Sandman swaps a bunch of stuff
Appetite for completely foreign media is much slower in English speaking countries but once in a while you get a major break through: Crouching Tiger Hidden Dragon, Parasite.
For iconic female leads: Terminator has Sarah Connor, Ripley from Aliens, The Bride from Kill Bill, Charlize Therons character in the last Mad Max movie. Buffy. I apologize for how narrow the genres are here.
I don't think the popular media for anything I just mentioned was too negative (maybe Black Panther?). Is it really just the fans? I bet the overlap of Rings of Power watchers and watchers of the stuff I listed is pretty big ...
edit: formatting