If you read the blog post of this very submission, it cites C# as #4 and climbing on the TIOBE language index. I know and work with a bunch of .NET developers, also, and I can't name one that's looking at the future with worried eyes.
In what way are they irrelevant in the developer space?
In my particular case, I tend to shy away from Microsoft development because the stack isn't really free, top to bottom and it seemed like MS was following trends instead of leading them (MVC was an obvious response and I see a lot of Railisms in it).