This builds on the success of Rust, but Rust has not been a success when it comes to [number of engineers writing professional code in the language]. By that me

This builds on the success of Rust, but Rust has not been a success when it comes to [number of engineers writing professional code in the language]. By that measure it's still incredibly niche compared to interpreted languages. The main reason why formal verification has not had even the success of Rust is that most developers (myself included) don't know enough about the area to take an interest, and certainly don't know enough about the area to pursuade skeptical managers. Unless a big company comes forward with a bunch of case studies about how they used formal verification successfully I can't see the developer mindset changing.