Is Rails Still Popular in 2018?
medium.com
medium.com
Anecdotally, my company uses Rails for new client projects all the time, so I don't think it has fallen as far as the author claims.
I'd think that part of the reason is people realised that Ruby is slow, and sometimes it matters.
From time to time I get seduced by the romantic idea of building a simple JSON-spitting Go/C#/Java backend for an app, but then I realize that I would have to hand-code an enormous amount of functionality that I would get for free with Rails.