None of the languages being compared against were released in the ubiquitous-internet age with things like Github and widespread blogging to drive interest and adoption.
Beyond that, Go certainly doesn't have the same backing from Google as C# had from Microsoft, on the other hand Microsoft had a monetary incentive to provide support and tools/frameworks as they charged for those proprietary implementations while Google is giving Go away under a permissive licence.
Anyway, for fun I looked at the language poll made here recently on HN and compared C# and Go:
C# 1130 likes, 465 dislikes Go 1126 likes, 365 dislikes
So it would seem that Go has reached the same popularity as C# here on HN atleast. https://news.ycombinator.com/item?id=6527104
Which doesn't seem to matter anyway. There are tons of languages released every year that fare even worse than languages released in 1980, despite having "ubiquitous-internet, Github and widespread blogging" at their disposal.
Those tools are force multipliers. If the initial force is zero, the output is still going to be zero.