I think your POV works in your very specific world view. As a head of an agency, hiring a developer that knows mainline languages serves a lot of good in hiring, keeping teams happy, and low turnover. We've all seen the agencies that hop on a new, hip language - only to go up in flames 6 months later because they couldn't find talent for their narrow viewpoint.

This isn't an argument against Go, moreso that your perspective is objectively elitist.