Choosing any language because it's in high demand is a bad decision, see "Why SICP matters"[0].
" I tell my students, "the language in which you'll spend most of your working life hasn't been invented yet, so we can't teach it to you. Instead we have to give you the skills you need to learn new languages as they appear." "
With regards to your statement, "It all depends on how you learn JS": That could be said of any language. The fact that you learned the differences between JS and C is what helped you when you were beginning, not that you learned JavaScript instead of Java, Ruby, or Python.