When I look around at other companies hiring Ruby on Rails developers, I see them focusing on three major traits: Super-smart; Large community following; Deep Ruby knowledge.
I definitely agree with the thrust of the article, but I run community sites and have run Ruby job ads for a few years and I can't recall seeing anyone looking for a hire with a "large community following."
In aggregate, across all the listings I've run, companies are most usually looking for experience, team working skills, familiarity with Agile practices, TDD experience and, sadly, the ability to commute to a certain location.