[gregjor]

When I’m hiring and get a candidate who seems very focused on a language, or only has experience with one language, I’m probably not going to consider them.

It’s not just the limited skill set. I’ve run into too many programmers who only want to work with the tools they know and like, which limits their usefulness in a team and in the business. Most companies write and use software as a tool to solve business problems, they aren’t all that interested in catering to what programmers think is cool or fun.

I’m all for mastering language and tools, as many as you can, but if you want steady employment keep your eyes on what employers look for.