Fortran still has a big fanbase and people actively fighting to keep it alive and thriving as much as possible. Maybe the crown will remain with C++ (in terms of fast languages), and maybe Rust will eat some of its lunch, but there seems to be a resurgence in the Fortran community to make sure it remains an important language in this space.

Julia has something similar but to a lesser degree. Its main problem has been the developer experience - the latencies (slowly getting better), lack of a great editor/LSP experience (the VS Code plugin is decent, but not yet great), lack of accessible how-to resources (people are starting to write more of these), and things like that.