Flutter seems promising and it has some great ideas baked in (drawing on canvas, hot UI reloading), but I don’t have high hopes for that project. Google is well known for abandoning their projects as they please and without a giant company behind such a monumental amount of work, this thing will never survive. It also comes with additional baggage (the Dart programming language) which pretty much nobody asked for. Sure it has some neat ideas, but a programming language needs around 10 years to mature and the entire ecosystem such as editor support, debuggers, libraries and so on. I do hope it takes off as the current state of cross platform GUIs is quite terrible and Flutter would be a great wind of change even if it comes with a cost of learning a new language.