I’m not so sure. First, they are already paying pennies to the writers. Second, who’s gonna write the prompt? The bosses certainly not, so they would hire prompters. Now, you cannot simply hire a prompter with zero experience in copywriting or editing; these people would not accept less than pennies for their work. So you just go ahead and hire people with writing experience. It’s easier.
Edit: besides, assuming AI will take over, if you want an original and catchy story, you need to provide a good prompt. I cannot think someone more suitable to provide such prompts than the writers themselves. Is like saying: anyone can create their own app with LLMs. Well, I can tell you my mom or my 21 year old cousin wouldn’t be able to do so (they wouldn’t be able to be more specific than a simple “I want a spotify-like app but in red”. They wouldn’t know what to do with the LLM output, even if it comes as an executable that you just need to drop in your phone). So you need developers here as well.