SEO doesn't even make a difference at this point. The main problem is Google's carved-in-granite PageRank. It often times prioritizes incumbent sites over newer ones, even if the newer ones are getting vastly more visitors. There are very specific loopholes in PageRank that can be very easily and reliably used to hide smaller, newer sites, by the way PR looks at a site with other cross-referencing sites. It's more Google's inflexibility in site structure (see also: Google's Webmaster Tools, Analytics) that causes this sort of overwhelming and lasting dominance of bigger, longer-lasting but irrelevant sites over the sites that should be replacing them.
On the other hand, we ARE winning in newer search terms. When Ten Desires came out, we were up all night through the release doing article creation as the info came out. We absolutely dominated Wikia in that case.