For the specific question of decompiling, as noted in the GP comment, you're already forced to decompile to a not-quite-C language because C's semantics just aren't conducive to accurately representing the hardware semantics. Not that Rust doesn't have its own foibles, but I suspect its core semantics are easier to map to than C's semantics without having to resort as much to a not-quite-Rust target.
It's definitely something I would like to see at least explored!
