Elixir as a language may or may not last. I'm betting it will, but even if it doesn't, it works well with Erlang which is going nowhere.

There's more a case against Clojure, granted. I think because Scala is seen as a bridge language is the another reason why it won't last.

Also the compiler drama... http://www.infoq.com/news/2014/09/scala-compiler-forks