This reduces filmmaking to only editing. Filmmakers won't be choosing between 10 different shots but instead between 10 different prompts and dozens of randomized outputs of those prompts, and then splicing them together to make the final output.
I see these AI models as lowering the barrier to entry, while giving more power to the users that choose to explore that direction.
Meanwhile with AI, given the same model and inputs - including a prompt which may include the names of specific artists "in the style of x" - one can reproduce mathematically equivalent results, regardless of the person using it. If one can perfectly replicate the work by simply replicating the tools, then the human using the tool adds nothing of unique personal value to the end result. Even if one were to concede that AI generated content were art, it still wouldn't be the art of the user, it would be the art of the model.