I agree that we’ll effectively have language moratorium until we have a new governance structure. 

Unsure!  Governance is needed to resolve conflict.  When there's broad agreement, "leaders" aren't really needed.  For example, there's been a bit of talk on python-ideas about adding a new `intmath` module capturing some frequently reinvented functions for which decent implementations are known but non-obvious (e.g., for generating the primes).  Nobody could sanely fight to death against something like that.  Even whining about it would appear petty ;-)

But let me ask, what do you propose to do about PEP 572?  That’s already been accepted, but not yet implemented.  Would it be exempt from the moratorium or scoot in under the wire?

Unless "accepted" has a meaning with which I'm unfamiliar, "exempt" is the obvious answer.  Changing to such an unfamiliar meaning would require the very governance structure whose present existence is denied by the case hypothesis ;-)