Well, it will have inpact on some fields - but I think, while most of us use chatGPT allready for a lot of tasks, we still use search engines as well.
AI has it's advanteges in not time sensitive informational content. The stuff, SEO builds up mostly is time sensitive and most likly commercial, though.
We will see a drop in relevance of informational SEO, but commercial is still a thing. IDK if we can still call it SEO, but optimizing for a search algo or for an AI model is not that different in the end. And Google will still need it's search engine to feed the AI. The game will be mostly the same - some markets will drop or disappeer, others will rise...