I have seen the short story Wikihistory linked from a lot of places (first, I think, from Boing Boing) and finally went and read it - it's short and amusing so you should check it out too. It does a nice job playing with online conversation structures; I think that this format for this particular story lays out all of the information you want to know about this scenario in a very compact way. I do not think I would have wanted a longer-form version of the story. I definitely like the use of the "n00b" as a justification for dialog explaining what ought to be common knowledge about the world of the story.
One thing that did strike me was that I found the title misleading - I understand it is just a title and meant to be evocative but there was nothing that felt Wiki-like to this story and its structure or content. I found myself trying to figure out why this dialog would be specific to a forum associated with a Wiki and what the overall content of that Wiki would be and came to the conclusion that I was over thinking it and the Wiki portion was just meant to hint at the on-line nature of the interaction in the title. Or am I missing something?