To suggest C++ usage is in decline is, objectively, nothing short of delusional. For Rust, C++ will the one to beat in ten and twenty years, provided not too many have already skipped onto some new hotness.
Rust is an objectively better design than anything else that has arisen in 30+ years. That doesn't guarantee success.
I used to hope a better language would displace C++, and for a time thought Rust might be it, but that better language turned out to be C++ itself. Nothing else is even on the horizon.
Oh and by the way, LLVM is 100% c++.
Saying it is too dangerous and complicated is absurd. It is easy to write safe code in C++, having been doing it for almost 30 years.
You are throwing around lots of assertions - challenge you to back them up with real data.
Sure, it'll stick around for some years yet but all those jobs will become maintenance jobs. Very little greenfield projects will elect to use it outside of niche areas (games and maybe embedded - UK salaries for embedded dev are terrible). Both C++ and Rust can use LLVM, so the generated code is likely to be the same.
If you were starting a greenfield project today why would you choose to do it in C++?
I forgot to mention Go too.