Already happening my friend. uutils. It is MIT licensed. Funnily, I recall someone had a story at MIT about not liking passwords. I'm sure they were right?
Check out the spice: https://users.rust-lang.org/t/im-shocked-the-rust-community-...
It may be happening in your bubble, yes, but not outside of that. They are not 1:1 replacements at all, with probably logic bugs introduced (see their Issues page) as well (call them regressions). I would not hold my breath if I were you.
I tried just a few months ago. Two shell scripts I use failed due to something wonky with sort.
Everything else worked well enough for my use case.