Then those outside groups should make a software foundation that's attractive enough to replace UNIX. I see Debian today tinkering with two additional kernels

Then those outside groups should make a software foundation that's attractive enough to replace UNIX. I see Debian today tinkering with two additional kernels - FreeBSD and Hurd, and both are written in C. Until some kernel 100% written in Rust/Go/modern C++ starts being attractive for OS integration there is absolutely no point in claiming it's possible and even a better choice. C has lost a lot of ground since 30 years ago, rightfully. User applications with GUI used to be written in something like C89. Games too. It's some people that just cannot grasp that it and its ecosystem have a huge merit over 'alternatives' when it comes to the ground it retained and still holds today.