It's important to keep in mind that there is always going to be a bottleneck on productivity. Sometimes that bottleneck is compilation speed, sometimes it's the language allowing unbounded growth in complexity, sometimes it's ecosystem immaturity, sometimes it's fixing bugs another language would have avoided, and sometimes it's a language's lack of expressivity. But there's always something.
It's worth keeping in mind that in some other language or with some other library or using some other toolkit, you'll still wind up with a bottleneck. It'll just be a different one (and maybe a worse one).
Right now Rust compile times are still slower than C++, when doing "make all", as everything is always compiled from scratch and crate binaries aren't shared across projects.
Delphi/Ada/D/.NET Native like compile times are still on the horizon.
