Go is a great language.

...but to be fair, writing UI and graphical applications has never been it's strong point, and still is not.

Although you can write NDK applications which steal the raw graphics context to do whatever they like (mandala, xamarin, unity, etc.), tapping into the android UI layer is significantly slower and more complex.

Given that the NDK website still says:

    In general, you should only use the NDK if it is essential to your 
    app—never because you simply prefer to program in C/C++.

I'm pretty skeptical Google is going to push anything based off of it as a first class citizen, ever.

(That said, the upcoming I/O has what, 4 or 5 slots devoted to NDK related things; clearly despite the android team, at least someone is paying attention to the fact that people use it. A lot. So you never know~)