The size difference is like Sutter Buttes versus Mahalangur Himal, so unless it's accelerating at the speed of light, C++ will be dwarfing rust's usage for many years to come.

This is the umpteenth time large tech companies have sponsored C++'s successor. Go was famously created to eventually supplant C++ at Google (or more specifically, solve the issue of long build times). Over a decade later, C++ is very much still in heavy usage at Google.

If I were a bettin' man (or if I were trying to increase my general employment odds), and the choices were between Rust or C++, I would pick C++.

That being said, if I were in a comfortable financial position, wanted to scratch a nerd itch, and have fun programming again, I would absolutely pick Rust over C++.

But those are two very different scenarios.