Elixir and Phoenix are amazing. I use them any chance I get. The problem now is that the ecosystem is still in early stages. You're gonna end up writing some more libraries whereas in an ecosystem like Ruby there are gonna be plenty of gems handling the typical things like Api wrappers.
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Have you looked at Elixir / Phoenix?
http://phoenixframework.org/
It has some Rails roots, so you might like it.
Elixir and Phoenix are amazing. I use them any chance I get. The problem now is that the ecosystem is still in early stages. You're gonna end up writing some more libraries whereas in an ecosystem like Ruby there are gonna be plenty of gems handling the typical things like Api wrappers.