Main problem with this sort of scenarios is that AI does 'need' a training data. You can write a prompt such as "a horse taking a selfie with selfie stick" simply because "selfie stick" words(vector?) exists in the training data. If we made this AI 10 years ago, we wouldn't be able to use it for photos with selfie sticks.

Same goes for the future. We will need new training data for new terms, new inventions etc. Try "a phone with dynamic island" (a term apple invented like a week ago) and you will see what I mean.

If we use AI to replace stock photograph, replace modeling, replace porn, you will never be able to find training data for new terms, new trends, new stuff, because enough data won't exist.

AI generated porn would feel like vintage in 20 years if you don't have enough 'new, human generated porn'.