If are Kotlin and Swift very similar to Dart so Kotlin and Swift developers are not any problems to change it to Dart.
Dart is very nice language and have some nice features which Kotlin missing so resign from Dart to Kotlin would be a reduction in quality of Flutter.
And Kotlin is not developed by Google so it will be not used instead of Dart in Flutter.
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If are Kotlin and Swift very similar to Dart so Kotlin and Swift developers are not any problems to change it to Dart.
Dart is very nice language and have some nice features which Kotlin missing so resign from Dart to Kotlin would be a reduction in quality of Flutter.
And Kotlin is not developed by Google so it will be not used instead of Dart in Flutter.