Josh Adams (@knewter) used to run yearly Elixir Users Surveys from 2014 to 2017, you can see the roundup here - Elixir Users Survey 2017. It was and is a great idea. I’d love to see it become an official thing, that is, a yearly survey backed by the core team and announced everywhere Elixir devs can be found (this forum, @elixirlang Twitter, Elixir Weekly and Elixir Radar newsletters, etc.).
It would be even better if we could get support from Erlang Ecosystem Foundation and include Erlang users in the survey. Though this may be up for discussion whether there should be one survey for all BEAM users or separate ones for Elixir and Erlang.
The goal is to get some stats to see the size of the user base, which industries the language is used in, how many companies are running it in production, what are the sizes of teams using Elixir at their companies, and so on. I suggest taking a look at Go survey and Rust survey for inspiration.