When you want to hire developers.
When you want to hire good developers pick Erlang, Elixir, Rust, Haskell, ML, LISP. Because chances they went out of their way to learn the language as it is not taught in US universities in depth. They are probably curious, good learners and could probably learn or adapt to other new things thrown at them.
I am at shop were we use Erlang and syntax has not phased new people that much. If typing . instead of ; is a big deal, then what are they doing to do when a netsplit hits or they have to understand other concurrency issues.
I don't know, I find Erlang's syntax rather nice, if anything it tells my brain "this is not C anymore, don't think like C". Works for me, any way.
There is Elixir of course if syntax is an issue. Elixir has other useful features as well but still runs on the same battle proven platform.
Edit: fixing typo. Pay -> play
The only languages that don't attract prima donnas are the "not hip" ones like Java, C++, C#, Perl, etc.
Interestingly Go programmers have turned lack of features into a definining feature in itself and are proud of it. If you want to be oart of the in crowd you have to use that signal.
That's the kind of person you want to hire anyway, unless you are super crunched for time in getting someone up to speed.
It is indeed hard to hire mediocre developers for Erlang: they stay away from FP.
(shrug).