I do think it's great, but I'm worried that as Kotlin grows, so does Jetbrains hold on IntelliJ and the IDE market. IMO, any change that benefits IntelliJ should theoretically be applicable to NetBeans.
Maybe it's already this way? I'm really not sure, but I'd appreciate a NetBeans or IntelliJ dev to clarify. It'd be awesome if these changes were done collaboratively.