While your comment is a bit snarky, there is some truth to it in that if rust successfully evangelizes a technique, I'd expect the C++ world to bring it on board if there is room and I'm sure room can be found.

The one topic to consider is this - is there a world where a language's existing code base is so large and the community so diverse that even _you_ would hesitate to break things for them? And at the same time, doesn't it make sense for that community to keep marching forward?

Yes the language has baggage and the path forward isn't easy, but there are still paths ahead for C++.

My advice to the rust community. Model yourself after the C++ strategy of evolution. Do not repeat the mistakes of the Python 2->3 world or the perl 5->6 world or what appears to be happening to Go. Don't break the past.