Strictly speaking, we delegate the ability to accept packaging-related PEPs to the PyPA following their own practices outlined in PEP 609 – Python Packaging Authority (PyPA) Governance | peps.python.org . So if they choose to operate without our delegation by simply not using PEPs they could totally do that.
Otherwise the only other thing I can think of that python-dev controls package-wise, now that distutils is out the door, is ensurepip.
Yep, or “please deal with this because we don’t want to” agreement depending your viewpoint of packaging. 