All our current AIs need prompts to produce content. So, you'd need to enter a prompt so that AI can produce a prompt for you.

But I guess you could develop some variant which just generates prompts in a cycle. But most of the generated prompts will pretty bad, so it will in turn produce heaps of crap.

That's where the human element is still needed - try a prompt, evaluate the result, tweak the prompt again. If this doesn't produce a good result, try a different idea. It's not even that different from how artists produce content these days (the create <-> evaluation cycle). Current AI is not good enough to be able to judge the produced content (that's why it produces so much crap after all).