[Gerdus]

I don't think speed is a big enough pain point for the python community at large to justify the pain of moving from cpython.

PyPy needs to use their great implementation stack to develop their own killer feature. Like for instance a small and fast python for embedded scripting or compiling normal python program to a small and optimized native executable.

[fijal]

So far just faster python have been a killer feature for some people :) True, it does not fit anyone, but hey, nothing does.