It won't be C. The reason as I see it is because of commodification. Executives want things as cheap and drop-in as possible. With C, you need a certain amount of skill. With a language like Rust that advertises memory-safety, they like that because it means you don't need as much skill anymore.

A similar thing is happening with game engines. If everyone is taught Unreal engine then you don't get in-house engines anymore which requires skill, because it's easier and cheaper to get some replaceable grunt to implement it in Unreal, perhaps with some off-the-shelf assets, which is perceived as "good enough".

It will be interesting to see how AI generation of code changes development tooling and the skills required.