> Complexity of Scala has been debated many times. Just because a language adds some new concepts and is different than other mainstream languages, is not enough to call it "complex".

It seems to me that the JVM community has moved on from Scala and is actively looking for a language that offers most of the benefits that Scala offers without the downsides.

Kotlin (from JetBrains) and Ceylon (from RedHat) seem to be the first two languages with a really interesting take on this problem. Gosu and Fantom are similar attempts, although I think these two already failed to gain traction.