Sorry, but Git won because Github won. Lots of people loved (and still use) Mercurial. It lacked the network effect because Github didn't support it.
> GitHub bet on Git. Bitbucket bet on Mercurial.
Bitbucket didn't lose because of Mercurial. They lost because Github had a better product (in terms of sharing code, etc). It also was neglected by Atlassian in 2010.
> It seems strange now but there was a period of time during the late 00s and early 10s when developers were pretty passionate about their choice of DVCS.
Sorry buddy, but there are still plenty of us Mercurial users. Maybe, just maybe, even dozens!
(Seriously, I use Mercurial for all my projects).