I'll jump to flutter once they have a convincing media player / recorder native component as well as a google map equivalent. If this has good performance on both iOS and android, with features comparable to native ones, then i don't see what can stop them.

Unless Apple starts implementing its own cross-platform sdk in swift... But judging by the slow pace at which swift is moving (compared to its "worl domination" ambitions, that is), i don't think it'll happen anytime soon.