Some Insights from a Julia Developer
It's great and all, but I can't justify switching languages for minor improvements over Python + numpy/scipy. I'd be abandoning:  * My deep knowledge and experience with Python
  * My entire codebase
  * The ability to work on projects with colleagues who don't also switch
  * The certainty that when I leave my current job, someone will be able to pick up after me
  * Zero-based indexing

I've started to do some work in Rust when it makes sense, since there's occasionally a compelling case and it's substantially different than Python. Incremental advances in programming languages just aren't worth it, and knowing that other people are probably coming to the same conclusion means I can't expect a serious community to ever arise around Julia.