The preview looks great, it feels like it will make a breeze out of building composable small views, which in turn will mean many small libraries will be released, and on goes the virtuous cycle.
As a fan of React and SwiftUI, I'm excited!
The problem then would be if there are some changes in Android that are incompatible with the framework, rendering it no-longer-usable.
I mean, Flutter is an SDK, and the other is an UI toolkit, but I don't see how Flutter UI will remain relevant, specially since Jetpack might take over.
Dart has survived this long so that doesn't seem on the cards.
You can tell a lot by what Google is talking about and what they are not talking about or actively avoiding talking about. Right now they are not talking a lot about Flutter (and even less about Fuchsia). Given the timing, you'd expect them to be full on shipping Flutter everything with the upcoming Android. Not a thing. Not happening at all. What ever they are doing with it, eating their own dog food is not it this year.
They just unceremoniously killed Duo after it was long clear to world + dog that that was the only sensible thing to do after that clearly failed to bring in a lot of new users from more fashionable things like Skype, Facebook Messenger, iMessage, Zoom, or Google's own Meets. Duo never came close to being in the same league. Same thing with Flutter. It's not happening and probably never will. It's a dead horse, they've flogged it for a while, it's not going anywhere. The next logical move is to shelf it.
Jetpack Compose on the other hand looks like it will be the main thing to do Android with this time next year. They are shooting for a release in 2021. 2021 Android will hit Beta probably in Spring. I'd say Jetpack Compse is well on track to release along with that around the same time.
I played with Jetpack Compose a few weeks ago; it's great. It might actually interest me in doing some proper mobile development. The old android SDKs with it's mess of XML, lots of java legacy, convoluted build tooling etc. is not very compelling to me. Jetpack compose does away with pretty much all of that. Good riddance.