I'm a C dev and I don't care if C ever go extinct, but the MCU toolchains are pretty much always C/C++.
If it was for a personal project, I wouldn't mind setting up a Rust compiler, but in a work setting, the uncertainty of unofficial crates (edit: I don't sleep enough) is a no go for a product that needs to be maintained for years to come.
And even when an official toolchain will be made, it will take a moment to spread.
But I really like all the features of newer language over C, so if I have the opportunity to change language, I will take it.