I think a valid concern might be - in 5 or 10 years, C++ still remains, just like Java and other "boring" languages. However, Rust might have been replaced by the next "Rust". That environment is still somewhat in flux.
I agree with you, it might turn out that C++ outlives Rust. I am seeing more codebases being created from scratch in Rust nowadays. We are just making bets on the opposite side.
I guess we both agree that the deciding factor should be what you think the future will look like in 5+ years. Nobody knows what will happen in 5 years, then it is a bet or an investment decision you make.
