Well, it's 21 century, nothing dies anymore but people. But you have to admit that it's not booming the way it deserves. I wrote in Erlang a decade ago and I thought that in ten years, surely, it will eat the world. Erlang got too many things right.
However, as people from other domains started employing its principles, Erlang's value diminished. E. g., if we now write supervisors in Python that run servers, event handlers and FSMs written in C++, and the system works fine, we don't really need Erlang.