I think you're correct for D, but for Rust, we'll see. It's a very slow moving industry. I do C++ work all day (embedded) and while there's no current plans to move to Rust (which means it won't happen within the next 3-5 years), I could see it occurring someday.

We're finally (usually) allowed to use C++17. I had to use C++03 at times circa 2019 - we're finally done with that. It's _really_ slow moving.