Except that is the exact reason why I would pick C++ instead of Rust, the Java, .NET and JS ecosystems are written on top of C++, and the libraries I might want to write bindings for, are also written in C++.

Adding another language in the middle will only complicate our toolchain.

Regarding Python, with the pressure from Ruby, PHP, JS and Julia JIT compilers, they will eventually get more serious about JIT adoption, and then there is ctypes of OS APIs.