Very true. We are adding Elixir team (very happy with it so far), most Ruby shops I know are either looking at Elixir or started using it. Given current rate of grows it looks like it will be very sizable community very soon.

Where is Elixir gaining most of its traction with companies? What types of problems? I've seen the Phoenix web framework mentioned many times, for example:

http://www.phoenixframework.org/docs/overview

I'm using it to convert a rails app into a stateful websocket-based service. Honestly I'm barely using the Phoenix framework aside from the channels and potentially presence. (Which isn't a knock on Phoenix, which is awesome, has great documentation for the most part, a very helpful community) I expect I'll make more use of it at some point but if you treat your app as something deeper than basic CRUD this is where the stateful processes of BEAM really come in handy.

In another app that was green-field we're using it to build a highly scalable estimation engine, which is to say, a glorified calculator over a somewhat complex data model.

Elixir is great for anything that uses concurrency. We're using it at my company for logging, among other things.

I've mainly seen it discussed in the webdev community

Web/mobile backends in our limited experience

I agree, I'm using Elixir in a number of production systems and I haven't come across a show-stopper yet, database packages, SOAP, documentation has improved quite a lot, even on Erlang.

I think it's also gotten a lot better since 2008 simply because concurrency has become so much more important. Multi-core chips were only just beginning to get popular at the time this was written, which was really driving a new focus on concurrency, since that was seen as the only way we'd really see speed gains. Because of that focus, Erlang became more relevant, and more popularized.