Ordered kwargs is in a PEP[0] that is in "Final" status, meaning it's been accepted and implemented and is making its way into the language proper.

[0]: https://www.python.org/dev/peps/pep-0468/

EDIT: On rereading, I see that the parent and GP aren't specifically talking about the kwarg-ordering benefit, but the general dict-ordering benefit. I would be surprised if dict did not become a synonym for OrderedDict in the spec in the near future.

The only potential disadvantage of dict==odict is performance, as anyone relying on the current arbitrarily-ordered dict behavior by definition isn't worried about the underlying implementation moving to a deterministic-by-insertion-order dictionary.