... Java 8 is a game changer that threatens
Scala, and Kotlin.
Well, Kotlin has the ability to generate Javascript. This could
turn into a killer feature as Javascript is growing in
importance, e.g. Node.js, html5+Javascript and the importance of
Javascript for Web GUIs as such. I hope they can make it as the
language IMHO is really well designed.
You missed out Ceylon from your list, it is threatened by Java
8 as
well.
Ceylon is not made for interoperability with Java such as Groovy,
Kotlin, Scala. I don't think they stand a chance if the Java eco
system cannot be easily re-used. I don't understand what the
Ceylon guys are thinking.
-- Oliver