If Go would just give us generics and improve performance a bit more, then yea I think it has a bright future. Rust on other hand needs to do the opposite and find some ways to simplify things a bit.
Julia and Elixir are both promising too but they both have some quarks to get past if they want to hit the big time.
I am really interested in Elixir. Seems like a language built with a purpose (scaling past the limitations of a language like Ruby) and has a focus. It doesn't try to be cute or throw in features for the sake of throwing them in but, makes a concerted effort to bake useful things into the language.
surprised not to see nimrod get a mention. it definitely seems like it would fit well into the lean language compiling to bare metal roundup.