I just don't trust Google with a programming language. I feel like Golang has escaped the orbit of Google and could survive without it (I might be wrong). But for Dart I'm pretty sure it would die fast and I don't want to invest time into it as a result.
I read that AdWords is built on Dart’s JS transpiler so I wouldn’t expect for them to just get rid of it. I really wish they would have pushed it over Go tbh. I’d love to use it for back end services.