Wikis for Elementary Kids

Our 4-6th grade students have almost finished the ArrrPirate Wiki we started 12 weeks ago. This is the fifth wiki we've done in the last year and may be the last. I know our purpose may have been a force fit for a wiki but is it worth it? How can the classroom teacher ever find the time? Can elementary kids really collaborate to come up with something better? Read more about it here. We're moving on.