Reno - 1:23 am on Jan 23, 2011 (gmt 0)
Google decides what goes in their index based on their algo-good or not. If G doesn't like what it sees they will move on
I'd argue that a well built site with a bunch of quality content pages has the potential to outrank Wikipedia IF that site is exclusively about the subject of the query. That is to say, stay focused like a lasor beam if you want a shot at ranking well at Google.
For example, a site utterly devoted to music phenom Willy Widget can go to #1 if it has a thorough bio, discography, tour schedule, photo gallery, discussion forum, includes links to other quality sites that relate to Willy, a URL such as AboutWillyWidget.com, AND got out early on all that.
So far, only the established mega sites seem to operate successfully outside the laser zone, and until this point, Google has accepted that, often reacting favorably. But things change and we're left to figure out where the new boundaries are.
In 2010 we saw Google attack SEO with some measure of success. Taking MC at his word, it appears in early 2011 that they now have their sights set on "content farms" ~ to be honest, if I was in that position, I'd be looking over my shoulder.