It should not have really surprised anyone that Witherington, when asked, came out in favor of having women in all the same ecclesiastical roles as men. He is a Methodist, and their movement has historically been associated with championing the "rights" of women. I am not even sure why someone asked him his opinion, or why someone else asked him to defend it, or why someone else asked him to defend his defense of it. I suppose the presumptuousness of youth tricks us into believe that ideas which seem novel and irrefutable to us are in fact neither novel nor irrefutable. They are instead merely tired and flawed.
I would like, nevertheless, to engage a fairly common argument which Witherington employed with reference to appeals to creation as a defense for complimentarian gender economics. Witherington argued that all economic disparity between the genders is a result of the Fall and the curse which God placed on woman as a result. I do not agree with that, but let us accept it for the sake of argument. Witherington then argued that in undoing the Fall, Jesus inaugurated a society (the church) which erased the consequences of the Fall for gender relations.
The most productive way I can imagine to evaluate this is to look at the effects of the Fall as a group. They are these:
There will be enmity between the serpent (the devil) and humanity.
There will be pain in childbirth.
There will be a disparity in gender economics.
There will be toil as a prerequisite for food.
Looking at that list, if Jesus has undone the curse of the Fall, he seems to have overlooked every aspect except gender economics. Humanity still wars against the devil, and Paul exhorts us in Ephesians not to stop this warfare but to intensify it with spiritual weapons. There is still pain in childbirth. Humanity still toils for food. If we are going to reject complimentarian gender economics, I suspect we will need firmer grounds than simply because it was part of a curse which is no longer in effect.