Go is awesome, and I'd love an excuse to use it in production. The problem is that being a young language, there aren't many libraries, and the ones that do exist are often at very early stages at best too. That means when you need a library to solve problems like printing a PDF, you are out of luck.

The other thing that makes me a bit nervous about using it in production is the idea of linking to the latest/head version of a dependency. Maybe I just don't properly understand the paradigm though.

Those nits aside, I believe Go has bright future and within 2 years will be mainstream. Meanwhile, Scala is better suited for projects that need lots of libraries and mature tooling.