Umair takes time to understand, but it's worth it: he's not giving answers but asking questions. It's up to all of us to figure out the answers for our own situations with a broader, questioning mind.
That's how I read the article. The model is sound and has been used outside of the web for years: where we go wrong is how we tactically apply the model.
It's not just the "control content from one bad seed" issue. Wikis are great to solve some problems, deliver some content, etc, but they're not the answer for everyone. There are different levels of transparency for us to explore...