If you want to remain an applications developer, then yes ROR/Djano is worth learning. If you want to learn to build critical system components in the back-end

If you want to remain an applications developer, then yes ROR/Djano is worth learning. If you want to learn to build critical system components in the back-end, you can skip RoR or Backbone, and learn stuff like machine learning, NLP, or building distributed systems.