C is like a "portable assembly", its goal is to "abstract computers" and that is all. The languages that have attempted to replace it are trying to "abstract problems", which comes at a cost that people are not willing to pay.

If you want to replace C you either need to come with a better "portable assembly" or have a significant change in the hardware architecture that requires the change.

BTW this constant shoving of Rust down the embedded world's throat doesn't seem to be working.