I definitely need a tooling ecosystem, so I'll be waiting for good integration between IDEs and LLVM for Swift. Maybe Atom or VSCode will get there soon. For libraries, when I really need something, I'll wrap it myself using C FFI. It is very easy to pass C structs by value or reference between Julia and C. Go is not bad either and does a lot of static checking for me. Swift sounds like for value types it should be easy. Java is super painful with the marshalling back and forth.

some of us get by just fine in happy ecosystems that exist outside of linux.