I do write a lot of Go and it fits in the Oberon/Modula-2/C family. It is a general purpose language and the design of the language does not really make it a system language. In fact, one could argue that many properties that people expect of a system language (e.g. no GC) are missing.

Currently, Go is indeed popular for network services and command-line tools, but I think that is due to it's standard library supporting those use-cases well. But Go will surely branch out as its ecosystem matures.