Uh, at least in my circle of developer and hobbyist friends Elixir and Erlang are blowing up. And reading the front page here, I would think the popularity of Elixir is not some small isolated phenomenon. What past language trends are you thinking of when you provide your source and make that assertion? Curious.
YOU'RE joking, right? Because you're looking at the data entirely wrong. The fact that a relatively new language has a CURRENT fraction of the interest of a more established one is an idiotic comparison to make, all that matters are the rates of change, and I challenge you to find another language with the slope of the "Jobseeker Interest" line on this chart:
Source: Consistently steep slope over time of Indeed job interest in Elixir plus the fact that ElixirConf doubles in size every year