AI generated encyclopedia kind of seems like a terrible idea. The entire goal of an encyclopedia is to get true (and hopefully unbiased) knowledge, which AI is known to be bad at, especially on the edges.
Honestly, you'd be way better off just using a basic rag architecture. When a user asks for a topic simply mirror the Wikipedia article and throw up a chat sidebar interface, so that the user can ask questions about it. At least by locking down your context window, you could minimize the number of hallucinations, which judging from some of the other comments sounds like it's already an issue.