The simple reason is that Elixir is competing in the backend web-services space, which is a very crowded space with many equally-compelling alternatives. As so

The simple reason is that Elixir is competing in the backend web-services space, which is a very crowded space with many equally-compelling alternatives. As someone who likes working with off-meta languages, it's clear that the default state for any new language is to die an early death. The fact that Elixir hasn't died is testament to its strengths.