I find it interesting how Rust is gaining momentum in tooling like uv and now rv.
Rust is the new C. Go had a shot but went in an applications direction. I predict that very soon, perhaps even inside of three decades, Rust will become the dominant, first-choice systems programming language.
Maybe - but in this case, Ruby is written in C, it uses C extensions when performance matters, but tooling for the Ruby language itself is all in Ruby. Rust isn't replacing the use of C in the core of Ruby (yet) - it's stepping in to the area where Ruby would have been traditionally used.