This is great. Glad you are thinking about this. Many of my colleagues are confused by wiki topics because they are taken to the bottom and don’t realize the OP is the main show. They also do not find the topic nav on their own.
Keep in mind that other posts in a topic can be wikified besides the OP.
@angus and I have been contemplating a knowledgebase plugin for creating a structured wiki interface for navigating wiki topics that belong together… maybe this can help us there.