[pinaraf]

Well, it weights in favor of Python 2, and considering that until recently the incencitives for Python 3 were still light... It's not really about having users, but having the possibility of switching from CPython to PyPy if you face performance issues.

[joejev]

PyPy is still not really a performance option for numerical computing.

[xapata]

Are you not satisfied with NumPy and associated tools?

[dagw]

Very satisfied, and that is why I can't really switch to PyPy