You know, it was fairly popular for a time.
> I don't have to personally know every language. Languages grow in popularity by picking up users.
This is a tautology.
But let's pretend for a second what you meant to say was "Languages deserve the usership they gain in a sort of mindshare stock exchange." Then let's rewind 10 years and show you Clojure, Ruby, Java, and Javascript.
Can you ever imagine someone from 2002 picking Javascript over those alternatives? Someone sane, I mean. All praise to the pragmatism of the 'net, but Javascript's popularity is a function of its largely unrequested deployment and the failure of competing products (mostly due to artificial and non-technical business-enforced nonsense).
And yet here we are with Javascript being so popular that startups are raising $9m just to build frameworks in them. And yet by any reasonable metric Javascript is a "worse" language. The most highly-recommended starter book for javascript is "The Good Parts", because a whole lot of the language is just so bad it has to be ignored or worked around.
All we're really doing is appealing to popularity as a justification for using perceived popularity instead of real technical metrics. Which is–to some extent, anyways–fine and good; it certainly is traditional for people to do this. But let's not pretend we have access to some deeper insight while we're doing it.