I have a lot of languages that I love (python, et al) that I don't get to user nearly as much as I would like.
[unqualified assumption] I would think it would be hard to find jobs in Erlang.
I've got a few cold calls over the years from companies in my area specifically asking for erlang experience.
I'm currently primarily writing erlang code at work. I've use it at my two jobs before this, though not primarily.
It's good technology, but I don't typically hire people who know good technology. I hire people who can recognize and create good technology. One of the erlang rock stars I hired at my current company did not know erlang a couple months ago.