Let me tell you that most C++ game dev never heard of Rust, so imagine how long it's going to take for Rust to be something usable in that domain? Right now in the real world of AAA games it is nowhere, it's not even a consideration so calling it "Rust Is the Future of Game Development" right ... For those who don't work in games, the tech there move very slowly, it's not your typical SV "let's use the latest fun and…
Probably because what AAA game developers actually use is strictly Visual Studio, not C++. Whatever is first class for GUI users on Windows in China and Ukraine is going to impact AAA game development far more than any non-GUI technology. It's not really about tooling. I'm not saying tools. Just Visual Studio. Visual Studio decides what will appear.
Then you have the build process, vendorizing your packages (so you don't fetch them off internet), etc. Right now .sln files and MSBuild rule there (like it or not).