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My guess is some kind of corporate sponsorship. Someone with deep pockets to maintain it, encourage new apis keeping up with the latest papers, and make sure it works out of the box with the accelerator people want to use this month.

The web framework part is basically sponsored by 37signals https://37signals.com/32

Maybe that's why Ruby is best known for Ruby on Rails.

A huge cultural shift. People in scientific computing speak Python and R.

Something would need to happen that makes Ruby far more attractive. Say performance parity with Crystal or Nim.

I think it’s more than that, Julia exists and adoption is still slow. Lua and torch were plenty fast and they were still replaced by pytorch. I think to compete with python you need at least a fraction of the de-facto corporate sponsorship for python in the ML space.

As a primarily Ruby dev I'd prefer the AI/ML ecosystem not be split-brained between two languages that are semantically 90% the same thing. Just learn Python and integrate the models into your Rails (or whatever) apps.