Are you saying this is what you'd like to happen? That you would like to remove the element of human creation?
Many sci-fi novels feature non-humans, but their cultures are all either very shallow (all orcs are violent - there is no variation at all in what any orc wants), or they are just humans with a different name and some slight body variation. (even the intelligent birds are just humans that fly). Can AI do better, or will it be even worse because AI won't even explore what orcs love for violent means for the rest of their cultures and nations.
The one movie set in Japan might be good, but I want some other settings once in a while. Will AI do that?
No, never. AI is built on maximum likelihood under the hood, and "maximum likelihood" is another name for "stereotypes and cliches".
I'm sure there are others for other cultures.
Whatever it was before all that, it's probably lost forever. Whatever is new gets instantly absorbed and recategorized, it can't be avoided.
There's only so much recombinations of those basic grand themes you can do before noticing it.