I expect the reverse: our tolerance for bland and generic messaging is already too high. With ChatGPT filling our world with it, there'll come a renaissance in clear, pointed, punchy text. Even if it's ChatGPT 5 or 6 generating it.
There's definitely going to be a niche of ironic text that the human can tell is not AI generated, looks like AI generated, and it subtly makes fun of AI at the same time.