Prompt engineer won't go away, it'll get more "engineer"-like. Knowing how to describe a point in a model's latent space for the generation you want is here to stay, but the black magic and art aspect of it will go away.
For example, in stable diffusion land, lots of people have intuition about the relationship between certain prompts and the output they produce. That intuition is embedding and training data specific, so it's not really transferrable (even to different fine tuned models for stable diffusion 1.5). However, I use clip interrogation to map the portions of the latent that my prompt is pointing to, evaluate the embedding text to find desirable/undesirable elements, then adjust the prompt or add negative prompts to navigate my generations towards what I want.
For example, in stable diffusion land, lots of people have intuition about the relationship between certain prompts and the output they produce. That intuition is embedding and training data specific, so it's not really transferrable (even to different fine tuned models for stable diffusion 1.5). However, I use clip interrogation to map the portions of the latent that my prompt is pointing to, evaluate the embedding text to find desirable/undesirable elements, then adjust the prompt or add negative prompts to navigate my generations towards what I want.