FWIW what we've seen in usability studies is that people who know JavaScript can pick up Dart without even noticing. (Literally, after an hour in a usability study we'd ask people what language they'd been using and they would respond with surprise, having not even noticed that it was a new language.)

Regarding trusting us to support a new framework, Flutter is entirely open source, so if Google every gives up, the code is still out there and can be maintained. Having said that, since AdWords is starting to use Flutter, it's probably going to be supported for a while.

I believe we have a sample app called "Flutter Gallery" in the app stores. See https://play.google.com/store/apps/details?id=io.flutter.gal...