It might put off not just Google, but also other companies using Java.

While that could be a great direction I'm not so sure about its implementation. You'd have to create a new set of APIs accessible to another language to work with Android and then convince people to move codebases that have existed for years at this point to a new language.

Granted they can work to make bridges, support both, etc but if the ultimate goal is to transition it's going to take a very, very, very long time.

But I'd love to see what they would come up with for this hypothetical transition :)

I suspect that they are preparing such a jump, at least as a trump card for Android.

There are only a few details about this, but some googlers are working on Fuchsia, a new OS for constrained devices, with apps written with Flutter.

Flutter can also be used to write Android apps by embedding its own runtime in the apps. In both cases, apps are written in Dart.

This would be a huge transition though ... it means rewriting the apps from scratch in another language with a completely different tooling.