Kotlin has no community process and is the work of single company. The dev experience is mostly bound to IntelliJ. Java is picking up the slack every release and actually innovates over Kotlin in new features.

Only when targeting Android.

When is JetBrains coming out with KVM?

What do you mean with KVM? A Kotlin-specific VM? I don't see the need for that as Kotlin the language is rapidly evolving into a higher level language that runs on top of JVM, Android, web and native platforms (iOS, MacOS, windows, Linux)

Thus it isn't a Java replacement to start with, a minimum common standard library, without having a platform to call its own.

Guest language everywhere besides Android.