(1) Open source models for image generation that are comparable to what DALLE2 or Imagen can spit out will be available by the end of next year. There will be nothing for OpenAI or Google to monetize.
(2) These models aren't magic. Often to get the content generation you want you need to finetune the models. 21st century graphic designers are well aware of AI image generation are looking forward to streamlining animation, etc. Half of the people I know doing ML pipelines right now are actually graphic designers. In a few years what formerly took whole studios will be able to be done by a single person. Want to make your own animated movie? With enough effort, fine tuning, and going through the generation of millions of images, it will soon be possible.
(3) By finetuning with your own unreleased images, you will always get an image model better at making your style of art than whatever is available to the public. You can use your proprietary fine tuned model to create art you enjoy or sell.
(4) Everyone should keep in mind that 50 years ago, to make a high definition film required a studio and millions of dollars to pay production crew. We're getting to the point where a single person can do that on their phone. I don't think the future is as dark as what everyone thinks it will be, and shaking out the tedium of jobs, even art, is going to help redirect our collective brain effort to more important tasks or more beautiful works.