Money talks.
Wikipedia continues to ride high in google rankings for one reason only : google is fattening wikipedia up for slaughter.
Google is launching its own encyclopedic wiki, Knol. The difference is each Knol article will be stewarded by a qualified editor, who gets paid by advertisements on that article.
Editors (and i mean real editors, not wikiplebians) will make money by grabbing wikipedia articles, cleaning them up, and posting them on Knol. Wikipedia cannot object due to their GDFL. A cottage industry is born.
Once Knol is sufficiently fleshed out, Google will prefer Knol to Wikipedia in its ranking algorithms (claiming altruism, the articles have been vetted) After all, google is in the business of giving certain sites preferential ranking.
The world gets a free, quality encyclopedia that not everyone can edit, but everyone can trust.
I'll be back to gloat in 18 months,
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