They have over 70,000 high quality links to that page (excluding internal links). Virtually impossible to compete with :/
WW.
At one point in the last couple of years bigmouthmedia were above them for a month or so I think...
With an exact match domain and a massive budget you could do it, without the domain it just wouldn't be viable. For "seo" I don't know what the domain status is, but for "search engine optimisation" wiki aren't going anywhere.
Out of the 5 exact match domains available, 1 is penalised, 1 is targeted to Australia, 1 is owned by someone who doesn't understand what a quality link is, 1 is owned by an Acorn member who (imo) isn't putting in any effort to rank it, and the other is owned by me and I have no interest in trying to outrank wiki.