I don't get the whole dooms day scenario.
- Google is working on Java 8 support.
- The current version of Scala supports the current Android stack.
- Depending on the timing, the next version of Scala might also support the then-current Android stack.
- You can always use Scala-for-Android (aka 2.11). Just think of it as a flavor like Scala-JVM, Scala.js or Scala-Native.