Our team took on a couple of C# developers and my manager got all excited about C# and decided that we should refactor everything in C#. I've since heard (from senior management) that he was a bit premature in this announcement and that I will be continuing to use javascript for my work, which makes sense as a front end developer.
Part of me is happy with this as I know javascript well enough for it not to get in my way when designing a front end, but another part of me rather likes learning new stuff and a whole new language was a potentially interesting challenge.