I'm trying to be clever but you insist on making me state the obvious. The reason I would accuse those folks of not thinking the issue through is because I am presuming they are not in favor of infanticide for the sake of parental convenience. Now if all late third trimester pro-choicers are also pushing for the right to kill a fully functioning infant for the sake of the mother, THEN you would have a point.
I don't believe that is the case, though.