I doubt dart will ever gain the momentum that go currently has.

go has momentum? I am not sure I would go that far.

Go certainly has buzz.

I keep thinking I should get around to doing a real project with it, then I get irritated by the strident advocacy and put it off again. For purposes which seem to call for Go I can easily just go back to C. Which is already beyond mature and plays nicely with almost any non-JVM language.

it is really early to bury a tool that has just started to take some shape. why do you have doubts?