Interesting, I am highly interested in convincing NASA to start using Rust for their embedded systems they use on ISS experiments and such. I would love to get more widespread adoption at the embedded system level.
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.