Well, I like Go, and it certainly has its use cases. But I personally worked on a hard-realtime safety critical mission Java project (if the program gave the wrong answer people could die, and if it gave the right answer late, tens of millions of dollars would be lost). We couldn't have done that without Java's concurrent data-structures (which Go doesn't have), without Real-Time Java's hard realtime guarantees, and it would have been very cumbersome without Java's brand of dynamic linking.

So sometimes Go is good enough, but sometimes you need the full power of the JVM.