Yeah, between Kotlin and Rust we now have two very well designed languages that should fill pretty much every need. To me Python, Ruby and Java are pretty much legacy at this point.
I don't believe either of those can compete with python+numpy (or matlab if you're masochistic) for numerical computation (and everything that comes with it).
I totally see the appeal of Kotlin. For me, my day to day job is JS and TypeScript makes that a top shelf experience. It seems like the one constant in my work has always been JS and SQL for almost everything I've ever touched. Though in my dichotomy, I never actually need or use Rust. I would like to find an excuse to write a library in Rust.
I don't think kotlin is TypeScript. Kotlin adds to java some nice things like coroutines, it is not only null safetly, functional programming and some sintax sugar. And also compiles to javascript and in the future to native.
http://www.grpc.io/docs/ OTOH you always have an easier time using a language with more support... so most of the times I'd say those legacy languages are the best option...
That is certainly true. In fact that's partially the reason why I'm still using Ruby for some of my projects. Kotlin though has the benefit of being able to use all the Java ecosystem.
I didn't say "perfect" I said "very well designed". I don't think perfect exists. My statement also was strictly about the languages themselves. Languages pretty much never fully go away because there is always some amazingly well done library that will be needed for virtually ever. Just look at all the math stuff done in Fortran. Sorry, I should have been clearer.