I was always curious why Ryan Dahl left the community. He finally answered that question; not the way I thought he would though:

"I think Node is not the best system to build a massive server web. I would definitely use Go for that. And honestly, that's basically the reason why I left Node."

Go may be an excellent choice for massive non-web servers, I don't have enough experience in it to say. For the product I work on, though, Node.js is the way to go. It's the best framework that allows us to use the same exact code on the server and on the client to create a fast progressive site.