The fact that Swift is at all usable on other platforms is pretty amazing, really, and it's a recent but quickly accelerating initiative. As far as taking over

The fact that Swift is at all usable on other platforms is pretty amazing, really, and it's a recent but quickly accelerating initiative. As far as taking over from Go or Rust, I don't see someone with a greenfield project picking up Swift as the basis of some arbitrary project. Instead I see someone working on a Swift-based app -- say for iPadOS or macOS -- and needing a server-side component and deciding that it enables better skill and code re-use to implement the server-side in Swift as well.