* Scala has been around since 2004 (public release) -- 10 years ago. (Not sure when the first stable release was but more than 3 years.) * Go in 2009 (public) -- 6 years ago. 1.0 (first stable release) was released in 2012 so it took 3 years to stabilize. * C++ in 1983 -- 31 years ago. ... It's been a long time. * Clojure in 2007 -- 7 years ago. The creator took 2 1/2 years before releasing it to the public. * Rust in 2012 -- 2 years ago.

It's pretty absurd to expect Rust to be stable right from the get go. The difference in all this is that most of those languages were closed before being released. Rust was open at a pretty early state.