I do agree that the question-answering search engine is probably headed the way of the dodo, but on the other hand, no search engine ever did question-answering

I do agree that the question-answering search engine is probably headed the way of the dodo, but on the other hand, no search engine ever did question-answering particularly well in the first place (even beyond that, such projects are deeply problematic from an epistemological point of view). LLMs aren't search engines though. They offer a new way of interacting with information, but they need to be provided with the appropriate context to answer questions well (e.g. as in RAG), which is where a traditional search engine still has a role even in an LLM maximalist future. Though I'd note there are other aspects of the web that are criminally under served these days. The itch I'm trying to scratch with Marginalia Search is just letting humans with websites find each other.