Second, "start coding in XXX without learning a new language" is a terrible selling point. I've seen this thinking appeal to misguided PHB-types and witnessed the result: immense organizational damage. In my experience, this isn't a necessary or sufficient selling point to good developers. Learning a new language just isn't that hard, and a big part of a shift like this is actually in learning the new environment's paradigms, APIs, and best practices.

To make the latter point more strongly: if you're having doubts about your ability to pick up a new language, definitely take some time to learn a few new languages. Do a tutorial, play with a few small projects, enough to get the flavor of the language. Your hackery will benefit immensely from this, even when you return to your primary language.