Well, the threat strikes me as only half made of Dunning-Kruger phenomena. The other half is the incentive structure of capitalism.
For a corporate ad exec (or film producer or pulp-fiction publisher) to resort to AI for copy or images or video effects, they don’t have to think it’s as good as what attentively conscientious art / writing / animation pros would do. They only have to think the much greater up-front cost of employing a human (not only in salary, but in turnaround time and contractual burdens) is not worth the greater quality of output vis-a-vis the immediate market appetite as they (the “haves”) judge it.
The real kicker is that many people become less aware, over time, of the difference, while the AI engines are increasingly gobbling up other AI mash as their own cheap input.