In particular, you could teach it to Physics PhDs, which might be useful as today they are mostly taught Python and so they end up leaning on libraries to go faster because the Python isn't fast enough.
Once upon a time a specialist in Computational Chemistry or Physics or whatever would be expected to learn Fortran, and it makes lots of sense to use Rust for the same purpose in the interim (eventually a WUFFS-like special purpose language seems like a better fit to be able to deliver absolute safety and better performance by not needing to care about generality)