[pjmlp]

Kotlin is not limited to mobile development, it only matters on Android thanks to Google's shenanigans, which is a different thing.

And even despite of it, they were forced to update Android Java to keep up with the JVM ecosystem.

> The next thing is also fairly straightforward: we expect Kotlin to drive the sales of IntelliJ IDEA. We’re working on a new language, but we do not plan to replace the entire ecosystem of libraries that have been built for the JVM. So you’re likely to keep using Spring and Hibernate, or other similar frameworks, in your projects built with Kotlin. And while the development tools for Kotlin itself are going to be free and open-source, the support for the enterprise development frameworks and tools will remain part of IntelliJ IDEA Ultimate, the commercial version of the IDE. And of course the framework support will be fully integrated with Kotlin.

-- https://blog.jetbrains.com/kotlin/2011/08/why-jetbrains-need...