I'm not saying this because of anything to do with Apple's Swift announcement. I'm saying this because it'll be a huge benefit to Android.
How so?
The language has a weaker type system than Java, doesn't support exceptions and requires error checking every other line, has very poor tool support (because the compiler was not designed with IDE's in mind).
Except maybe add a few developers who refused to write code on Android because of Java, I really don't see what Go would bring to Android.
> when you can use better languages like Kotlin, Scala, Groovy, Clojure is asinine
You seem to be piggybacking an aspiring JVM language (Kotlin) on top of three other alternative ones that have already made it (Scala,Groovy,Clojure). Because that trick's already been done before with them (i.e. Groovy piggybacked on the quality of Scala and Clojure), it makes your list of examples of alternative JVM languages seem disingenuous.
I agree with your last sentence, however.