C++ is not the language in daily imminent danger of fizzling. Its proven value makes it worth picking up by thousands of people each week, year in and year out. More pick up C++ for professional use in any such week than the total employed coding Rust.

Rust is the language that, if not adopted fast enough, will pass its sell-by date and fizzle, like so many languages before it. Its true fans should be pulling out all the stops to try to make it easier to adopt. Instead, most do their utter best to prevent wider adoption, containing it as much as possible to the ragged few like themselves willing to tolerate any infelicity.

Rust's fate will be chosen by fans' actions, not their beliefs. Those actions are its doom. Judging by those, Rust will end up yet another potentially interesting language that never took off. I will know whose fault that was.