1 - there is so much money tied up in the search -> clicks for ads business model. Content providers were happy to let Google scrape their pages because indexing in Google leads to clicks. They won’t be happy to let OpenAI scrape their pages because it will lead to many fewer clicks, even if OpenAI can solve the source attribution problem. As a result, there will be many more walled gardens if ChatGPT becomes the dominant method of search as content creators see their typical stream of revenue dry up. Eventually ChatGPT will become useless as its training data becomes more and more obsolete.
2 - Google News already got sued into oblivion by content creators for summarizing news articles. (Google worked around it by removing the article snippets). ChatGPT is just doing the same thing but for every query. Their legal exposure is going to be huge for the exact same reasons.
3 - Lastly, how will OpenAI make money on ChatGPT? Advertisers won’t pay to “maybe” show up in query results. A monthly subscription? Unless the results are drastically better than Google that will be a big pass from most people.
Could OpenAI become the dominant player in search? Sure, there is a path there, but I would probably bet against it right now.