[pjmlp]

To kill C++, Rust needs to grown an ecosystem for game engines, GPGPU shading languages (Metal/HLSL/CUDA), OS GUI stacks (Qt/WinUI) and composition engines,...

It might happen, in a couple of decades though.

[humanrebar]

Also, nothing is even close to matching the ability of C++ to build against other C++.

Even if Rust had Rust alternatives for enough of the interesting niches, it will take a loooong time for all the relevant software to either get rewritten or reach end of life.

[pjmlp]

Yes, a good example is that despite 40 decades of trying, there are still domains that C++ failed to take away from C.

Companies rather invest into hardware memory tagging than trying to rewrite C applications into something else, in those domains.