Does it? RoR was the craze 2-3 years ago but I honestly haven't heard much about it as of late... Now everything seems to be Node.js
By the way, Rails is the craze from maybe 10-6 years ago. consider e.g. [0] But it is still far, far from dead. Time flies, but not as fast as you suggest.
[0] https://www.google.ca/trends/explore?date=all&q=ruby%20on%20...