If you have the slightest interest in the issue of concurrency then you should study Erlang and Clojure. Since Moore's Law has largely faded, and we now gain speed by putting more CPUs in each server (rather than having the individual CPUs be faster) concurrency is an increasingly unavoidable aspect of programming. Joe Armstrong (Erlang) and Rich Hickey (Clojure) have both spent an enormous amount of time thinking ab…
How do you feel about Go?
I think Go is very interesting. One thing that I like about Go is something for which it is often criticized, which is the ability to create a binary that holds all dependencies. Some people are critical of these "fat binaries", but I have lost countless hours dealing with dependency issues, in various languages, and dependency issues are my least favorite kind of computer problem, so any language (and/or eco-system) that gives me an easy way to solve dependency problems is interesting. Likewise, when I work in Clojure I often go with the "uberjar" option to deploy, which often means the only outside dependency is the JVM itself. But Go can go further, as there is no need for some VM, like the JVM.