Earlier quoted context omitted.
Modern C++14 provides quite good support on those fronts, and modern Java8 has lost most of its "code notoriety". But that's just arguing back and forth. Here's the real argument: What popular OSS projects of noteworthy scale are being developed in Go? I know a few dozens in either Java or C++, and even a few fairly noticable Scala projects (Spark, Flink, Play, ...), but I yet have to see anything written in Go that…
If you want examples of "industrial-sized" Go projects right now, you may have to look at case studies for proprietary cloud infrastructure, e.g. CloudFlare, Fastly, DigitalOcean, SoundCloud, and SendGrid. These companies obviously don't open up their product code, but they've been happy to share some information about their use of Go.
But what I would really hope to see is Go being used for anything else than servers/services. I understand this is all the rage for certain companies, but none of that directly touches my own interests. Is Go only good for that niche, or will we see Go being adopted outside that "web services world"? E.g., for building old-school desktop apps, Go's concurrency features might be pretty cool - if its not too low-level for that?