Ruby

The title is self explanatory but I'm going to add some details just for the sake. I've 9+ years of experience working with Ruby and the usual Rails stack, but I'm a bit scared on how the language became niche. I'm thinking about learning/switching to a JS framework and change job before I'll be the last one standing using Ruby. I'm mainly focused on backend, so the question is: does it make sense to change to JS or should I go for another language?