Provocative headline but the article isn't so compelling. There's some value in framework stability which goes unmentioned. Node doesn't seem quite ready for broad prime time use. Rails still excels in developer productivity which I think continues to be an important attribute.
Article might show a trend that rails jobs are declining, but that's not true for my team. I'm looking to hire 12 ruby/rails engineers between New York and Seattle offices.
JavaScript is eating the world. But I'm all for Elixir/Phoenix, which feels like Rails but has Erlang under the hood for much faster development and performance (if WhatsApp can scale to millions of users with Erlang/OTP, so should a Phoenix app).