[mojuba]

That would require them to dump JavaVM and rewrite everything except the kernel (and whatever parts are theirs but are not on JavaVM). And invent a new static programming language that is not GC-based and is not Go.

Also please, that should probably be done by a company that is not Google.

[JimDabell]

Android has never used the JVM. Early versions of Android used Dalvik and later ones use ART.