We came to the same conclusion at Kubos, and moved from C to Rust for most of our flight segment/application code (embedded Linux on the satellite OBC).
The biggest challenge is to prove that it works. The space software community historically is very conservative and risk-averse, and mostly for good reason. As Kubos (and hopefully others) get more flight heritage with Rust on the flight segment, it'll be a much easier sell.
That's the biggest obstacle I think. Someone will have to break the seal and establish that "Rust in Space" actually succeeds consistently, then larger "trad space" organizations will follow.