Comment by asa400

Yeah agreed. Popular is a good first approximation, but to be more precise I think you want tools where the incentives in the community reward stability over features that require breakage, which would include languages and runtimes like Erlang and Clojure.

Neither is popular when compared to for example Python or PHP, but they both have cultures that care about stability in the core runtime and the libraries. Most folks probably don’t know that about Erlang and maybe think it’s some new whiz-bang thing, but Erlang is incredibly stable and well supported by a dedicated team that has been doing it for years and years at this point. I don’t know if Erlang will be more or less popular in 20 years but it 100% will be around and be receiving updates, I would put money on it.