That is a noble goal, first LLVM and GCC need to be rewritten in one of those languages, then CUDA, Metal Shaders, DirectX, Tensorflow, Qt, WinUI, ....

So even though managed languages and better systems programming languages are making their replacements, somewhere down the stack there will be C++.

And then to top it, as long as people insist in using UNIX clones, C will be there as well.