Making C go away will require major rewrites of projects that have millions upon millions of hours of development.

Yep. And it'll be done. Yes it'll take a while, but this is what it means for C to be like COBOL (which also still exists). But the more and more it can be marginalized the better we'll all be security-wise.

The rewrite-it-in-rust gang arrives in 3, 2 …

Cattle not pets. They're just computer languages.