Not necessarily. Think of FAQs for mailing lists as an example. A wiki for a blog, even a group blog, is a bit unusual (at least, I can't think of any), but I don't see why the principle couldn't work. Each LW post is a work by a single author, idiosyncratic and focused on a single aspect. It'd not be surprising if a comprehensive wiki article - which draws on and summarizes/synthesizes each relevant post - could be very useful.

I would also like to keep the articles very minimal and focused primarily collecting references to the relevant OB and LW posts. I think the sheer amount of work that alone will take requires a wiki though. I don't think a single page could cut it, and the sites are hard enough to navigate for someone like me that has followed OB since the beginning.