> prescriptive nonfiction is the canary in the coal mine

Self-help is not the canary for other genre. Self-help doesn't comme with significant art. Their consumer gets a better experience through LLM that extracts the substance and contextualizes it.

It doesn't tell what will happen at scale regarding fiction and other content where people tends to expect a genuine human contribution. Sure you can get success with AI-written or AI-assisted writing, but it doesn't mean human written books will no longer catch interest.