A modern programming language that makes developers happier.

kotlinlang

Adoption in big companies or even big projects like Vert.x does have a wall.   Android is a way around the wall for some projects.  And others will just be slow.  I think there needs to be constant momentum and growth, no big bang.  Unless Google comes out and Say "screw Java, you a should use Kotlin on Android, we do."  then there is not going to be a massive shift.   The speed can be improved, but I don't see a secret formula to launching Kotlin like a rocket otherwise until it just gets enough mass on its own.   And that's ok.  It's a long victory and marriage, not one night stands. 