If Treasury and Fhfa (fannie) / and (Freddie) enter an amendment / agreement whereby they by contract are set on a course to freedom, that path could only be undone if contractually it were allowed or amendment.
That contract would have to unwind a bunch of corruption, but it could happen.
With that not even a new fhfa director or treasury sect could unilaterally void it.
Would have to put some power back into the hands of the company's that by contract.