I think LLMs are fine for a "first pass" on a topic, but if I am researching something, I want a primary source rather than just the LLM-generated output. Do they have the primary source?
Studies showed wikipedia was about as accurate as encyclopedias, so that fear was already debunked. That is not true for LLM, LLM are much less accurate than encyclopedias still since there is no limit to how far you can push them while encyclopedias and wikipedia stay in domains where they are still mostly accurate.