I like a lot of things about Erlang. But the main reason I would be wary of using it is that it seems like an all-or-nothing kind of thing. The distributed actor model effectively means Erlang everywhere. This contrasts with RPC, queues, http, etc. where a variety of technologies (and languages) can be combined together. And an all-in approach seems laden with risk - all devs and relevant technologies need to fit in with the Erlang stack.

And if you are not using distributed actors, then why bother with Erlang at all?! (It's a nice language to be sure, but there are lots of nice functional languages available so the competition is pretty fierce).