Look at it from the other angle, there are many developers (myself included), especially younger developers who would much prefer developing rust to c, and for at least some of them, don't want to learn how to write c (including how to avoid undefined behavior).

> I've written my own Git clients and have built a web server around Git repositories. I don't want to lose the hack-ability of Git.

How does the git project using rust inhibit your ability to do any of that?