Longer term computation isn’t really the limiting factor for generative AI, it’s training data. Generative AI is like Google search before the web responded to their search engine existing. There’s a huge quantity of high quality training data which nobody had any reason to pollute ready for the scrapping.

But modern search is hampered by people responding to algorithmic indexes. Algorithms responding to metadata without directly evaluating content enabled a world of SEO and low quality websites suddenly being discoverable as long as they narrow their focus enough.

So longer term it’s going to be an arms race between the output of Generative AI and people trying to keep updating their models. In 20 years people will get much better at using these tools, but the tools themselves may be less useful. I wouldn’t be surprised if eventually someone sneaks advertising into the output of someone else’s model etc.