There's been a lot of ruby code written on commercial projects, I think the developers (and customers) would disagree with that. I also think you're way off on

There's been a lot of ruby code written on commercial projects, I think the developers (and customers) would disagree with that. I also think you're way off on the amount of difference between C# and COBOL. The fact that COBOL requires good tooling to be usable is telling in and of itself.