You get anime

They create satire. Everything will be a joke, eventually.

That's been the case for large chunks of culture for quite a while now. (In part that's what post-modernism was about.)

Can you elaborate on the post-modernism comment?

At risk of exposing my rather shallow knowledge of the topic, one aspect of PoMo is "everything is an inauthentic quote of something else and everything has already been done to death - so embrace irony and self-reference and achieve sincerety by self-awareness of your own insincerity".

This sounds like pop art—which some see as a precursor to post-modern art, and some see as an early type of post-modern art.

To some extent this already happens right? Popular fiction has its own laws for pacing, style of dialogue, tropes, the way characters behave etc. that is highly influenced from the canon of fiction before it and totally different to real life. Readers expect and anticipate this.