"git won the mindshare war" Sad, but true...
The article is also mentioning bad state of Mercurial, any idea what he could have had on mind? What's wrong with Mercurial these days, beside its less widely used than Git?
And in my very biased opinion, Atlassian markets themselves with an aggressively old-school mentality (closed source everything, monolithic software, questionable terms of use, strong force in the enterprise market, etc.), which makes Mercurial look bad by association.