Corker won't leave for another 15 months. Plenty of time to screw shareholders, especially since the big zero capital day is only a few months away. Congress will wait until this "sudden emergency" of zero capital comes up, at which point they'll catch the "do something" fever. That's when they'll all look to Corker as the "most informed and ethical man in Congress" to lead "GSE reform". They'll pass the "save the GSEs Act", the purpose and language of which eliminates the GSEs.
That's just my cynical nightmare scenario.