I have a strong feeling that Fuchsia will not be abandoned. I can't put my finger on it, but Google's approach and tone around Fuchsia feels really different from how they talked about / marketed Reader, or even Wave, or other things they shut down.
I'm an Android developer learning Flutter and Dart out of both curiosity and an gamble that it will likely be a faster-improving way to make cross-platform apps than other approaches (like Kotlin + Swift, or React Native, or the others)