It is publicly editable, albeit with some checks and balances. Any reasonably established member of the forum can request an account, subject to my approval. In addition, anyone without an account can post edit suggestions in the Projects board.
Realistically, a lot of the traffic we get is from bored schoolkids who are looking to troll. Those are fairly easy to weed out from a forum, but the maintenance cost of the Wiki would go through the roof.
Over the years, we've had a large number of contributors come and go, some long-standing an active, others just making a few one-off contributions. While I readily admit that this wasn't recently the case (with the brunt of contributions coming from Tom, and occasional adjustments from me), I see no reason to rename the Wiki to reflect this temporary state.