What about Python? JS, ES? Python is taught everywhere and clean, used everywhere (Pi, AI, Web…), JS/ES has Node.JS now, so one shouldn’t focus on Java, PHP, Ruby…?
We tried to start a CMS from Python/Django, I wanted to give a try to Elixir and ELM but too few web libraries, we finally made “the horrible choice” with JS but with Node and React, we actually found a very productive (and dynamic) tooling, community, ecosystem… and ES6, TypeScript or even Dart are cleaning the JS, so all in all… we finally didn’t get the best tool but “the less worst” for any scenario, whatever the platform, Server Web iOS or Android…
Code everywhere (you find JS coders easily), run everywhere… I don’t see anymore place for Java, PHP or Ruby, but in legacy systems…
With WebAssembly coming, I’m waiting for such a universal stack…: Elixir on both the terminal and the server, or ELM on BEAM? 
