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.