I realize I've started a pretty ridiculous language war; that was not my intent. But I still cannot understand why anyone would want to use a language that is mostly meant for non-constrained environments, does not provide some major productivity advantages over JVM languages while being slower than JVM languages. I would totally consider using use Go if it targeted the JVM.

You say some people consider the JVM a liability. Can you please explain why? As far as I can see, the JVM has two disadvantages: a high RAM footprint and a slow startup time. But on server-class hardware (and I believe that's probably the main environment for Go), it's hard to beat the JVM's performance, and nothing even comes close in providing similar monitoring. So -- and I'm asking this completely seriously -- why would anyone consider the JVM a liability in such an environment?