Maybe I'm wrong, but I have the impression that Ruby is now an expert's language, and much less accessible to beginners than it used to be. And, while it remains useful and used, it's not growing...

When trying to learn it, I encountered incompatible examples and tutorials, complex and changing ways to update it... and then my toy code stopped working. I eventually found the cause of the code-breaking change, fixed it... thought a bit, and decided against ruby. That's just me though.