The power of Java is that there is more than one JVM and that can really save you a lot of money/developer time if the world changes under your ass ;) i.e. had a JVM based graph database, ran it on Hotspot -> big GC pauses, moved to Zing no more pauses. All we needed to do is run a different VM and problem went away (new problem was of course that Zing costs but not much, also now with Shendoah coming for free we could probably have moved to that)

With GO you can't do that yet. If your app is not latency, bound but throughput bound there is no place to switch too other that a rewrite. That flexibility of deployment on JVM tech gives us a lot insurance for no costs, until we need it.