Heck, from what you say, it already got bored with Android -- if Fucshia is to replace it in say 2022, it means that Android just lasted around 15 years as a platform.
I'm no big fan of Google, but 15 years is plenty long enough. And really, Android is definitely struggling and showing its age by this point.
I have the opposite viewpoint on this. I've worked on mobile the last 5 years or so, and dedicated native Android the last 2.5 years. The last year or two have been dramatic revolutions in the Android developer experience, from my perspective. Things like ConstraintLayout and full Kotlin support with ktx have opened up a new world for me compared to the state of the art several years ago.
Then you look at companies like Peloton using large form-factor Android devices in their core products, and Samsung DEx using Android as a seamless mobile<->desktop computer.
To me it seems like Android is just hitting it's stride. Who knows though, it's Google.
This is what the comments above were alluding to, a "final release" before the project is abandoned. Installations still continue, in the same way there's probably places still doing the books on a C64, but it's no longer supported.
I think it makes sense that it would go back to the drawing board and try to make something better from scratch.
Time will tell.
If this is true, and if the other rumors about Fuchsia replacing Android are also true, then I doubt Flutter and Dart are going anywhere.