The problem for Ruby & Rails long term is that it's lost the battle in a lot of different areas. Education will use Python or Javascript if they want an interpreted & loosely typed languages. Numpy dominates the scientific/computational space if you don't want to use Matlab/R/Julia/etc. pyTorch is the way into Machine Learning.

Ruby is starting at a knowledge/awareness deficit and long term it's going to be hard to keep a quality edge to make up for that.