I think concentrating on the language is a mistake. Once you can grok a few, perhaps at least one imperative and functional, you can learn any other in a matter

I think concentrating on the language is a mistake. Once you can grok a few, perhaps at least one imperative and functional, you can learn any other in a matter of days. Sure, mastery takes much longer but in my experience most businesses hire for effectiveness to make change not be a guru of language X and Y.