Two Wiki maxims for consideration:
Delete pages that are not exceptional
If we cannot create a page that is exceptional, perhaps we should simply delete it. If there is a topic that is not covered here, that should not be taken as an admission of ignorance, but an implicit respect for the expertise of others.
Discovery should be possible with aimless stumbling
Wiki should do what it does best. You should be able to stumble around aimlessly, using (say) RandomPages, and have an extremely high signal-to-noise ratio.
Wiki should only be a dictionary for items where this community has exceptional interest & expertise. We can be proud of our pages on UnitTests; the old page on GangstaRap, on the other hand, was an embarrassment.
Discussion Structured by Wiki Gnomes
Wiki depends on the work of WikiGnomes to keep discussions structured, which is part of the reason the SociologyWiki pages are a failure: no gnome will touch those pages.
Debating and Deleting
What it boils down to is this: Every time there's a debate about whether a topic is OnTopic or OffTopic, we should ask ourselves "Can we do the topic justice?" If so, perhaps it should stay. If not, perhaps it should go.
Wiki At Its Best
All of the above arguments reinforce Ward's preference InFavorOfDissertation. So those who also feel that way, start contributing instead of spending your valuable keystrokes in discovering, discussion, disagreement, debate and deleting. In other words: Make Some New Pages and be sure they are Pages That Shine: ReallyValuablePages.