Agreed, I think timing with Go is a huge factor. Though I think the size and scope of Go's popularity is overstated. I looked into it for a recent web project and found many formerly popular libraries now unmaintained. I felt more confident and went with Django on Python 3.5.

If I want something compiled, the killer for Go for me has always been C ABI incompatibility. It's its own island. I'm not saying I wouldn't consider using Go for some things, but that has been a big redflag vs other choices.