We see no realistic path for an evolution of C++ into a language with rigorous memory safety guarantees that include temporal safety.
A large-scale rewrite of all existing C++ code into a different, memory-safe language appears very difficult and will likely remain impractical.
Tough spot to be in, but I'm glad there are more and more people calling out for a transition away from C/C++. One can only hope that Rust doesn't become the new C++ aka the garbage dump of programming languages. Every large player wanted to write C++ in their own way, so they added it to the language and now we have this... thing.
I am also very interested in seeing what the next generation of Rust-inspired languages will look like, and not because I am dissatisfied with Rust today. Rust has significantly raised the bar of how a good programming needs to work and any new language in the systems programming area (and beyond) will inevitably be compared to it.
Unfortuately c++ interoperability is hard. I wouldn't write c++ without vector and other containers (templates). Or classes complete with inheiritance (rarely multiple) and thus name mangeling. I now have millions of lines of that stuff and it is hard to write anything else because it has to mix.