Did anyone say anything about rewriting the entire Android Framework? Nope.
It was about Go becoming a first class citizen on Android. That doesn't mean it can coexist with Java for someone who needs a fancy IDE.
It already IS. You can compile Android NDK libraries with Go today. It isn't that useful because the NDK isn't hooked up with the Android framework which means you don't get lifecycle events. There was a whole Android framework written over the past decade or so in Java that abstracts this.
