But ask yourself this: do you work in a team or alone? One of the first sentences is:
"While highly effective, Scala is also a large language, and our experiences have taught us to practice great care in its application."
And thats the biggest issue - Scala is a bit like the JVMs C++, you need capable programmers in order to not fuck it up, because it contains every paradigm ever invented.
Go on the other hand is much simpler, and I like it for that - there is great value in simplicity.