There's a "point of no return" when you start to struggle to hire anyone on your teams because no one knows the language and no one is willing to learn. But C++ is very far from it.

There's always someone willing to write COBOL for the right premium.

I'm working on Rust projects, so I may have incomplete picture, but I'm from what I see when devs have a choice, they prefer working with Rust over C++ (if not due to the language, at least due to the build tooling).