If you want a job you can easily switch for an equivalent job, which seemed to be your pitch for using a boring language, then that job is at best going to be a 9-5, which will take up something like half your waking life (at least for the decades when you're the most healthy). I'm a big believer in life and hobbies outside of work (and when I want to learn a new programming language, I look for a way to do it on the clock), but an engaging, interesting job that pays less is often a very worthwhile tradeoff.