Regarding Elixir specifically, the situation is much more nuanced; I went to ElixirConf last month, and the impression I came away with was that most companies present, and most speakers representing their companies, were desperate to find Elixir devs. And most attendees who already knew some Elixir were not looking to move.

If there were a sudden event that caused a new army of developers to learn Elixir, such as a Harvard or MIT course switching to it, it might change this reality.

But for the time being, Elixir developers are in short supply in relation to demand, so we tend to be treated (and paid) well. Our interviews are probably less frivolous, as well, because companies can’t afford to miss an opportunity to hire folks who know Elixir (or can learn it easily) just because they can’t invert a binary tree on a whiteboard (https://mobile.twitter.com/mxcl/status/608682016205344768).

Timing-wise, this is probably the best time to get into Elixir, and get a head start before it reaches critical mass.

Lots of interesting companies are using it, the community is fantastic, salaries and dev satisfaction are among the highest in the industry (https://fossbytes.com/these-programming-languages-pay-highes...). And besides, it’s an amazing language and ecosystem in its own right.