This immediately brought to mind this article: http://jsomers.net/blog/it-turns-out. I mean it vividly popped into my brain because of the utter nonsense of this claim.
It doesn't turn out that an army of ignorants knows more than an expert. What turns out is that free trumps paid, and (perhaps surprisingly) can muster an enormous army of manpower, which in turn leads to a comprehensiveness that is unattainable by a traditional monetary business model. I mean you don't need to look very far to find factual inaccuracies and indeed slander on Wikipedia that can not be fixed because the rules are not oriented towards truth. So to draw the vacuous conclusion that Wikipedia won because its articles were better than Britannica belies a sort of willful ignorance about how the world works.
That's not say doing an end run around overly comfortable gatekeepers isn't a good thing in general, but man what a braindead quote.