I've also seen the writing on the wall for leaving Rails/Ruby. I think a lot is down to Ruby the language simply not being well-suited for an increasingly multi

I've also seen the writing on the wall for leaving Rails/Ruby. I think a lot is down to Ruby the language simply not being well-suited for an increasingly multi-core/concurrent future. That said, a more reasonable approach is to begin transitioning a few projects at a time, and make sure you've solidified on your new tools of choice before chucking the old ones. I remember a few years ago I teased with ditching ruby for node.js. I'm glad I dipped my toes in the water and waited for Elixir.