The pypy folks and a bunch of other alternative python implementations have pooled together and are working on a soft fork of the c extension api to enable existing established projects that make heavy use of the c api to better work with the superior faster python implementations.

I believe this is the way forward. Existing packages are essentially tied to cpython because that’s what the python.org website offers for download, and people will just use that by default.

Once all major packages support the new c api, it will be easier to just use something other than cpython by default.