The trouble with doing that for Freakonomics is that the work on abortions reducing crime, which has been proven wrong, is the first chapter and the centerpiece of the book. It's the thing that they use to exemplify the "freakonomics" approach in the rest of the book.
do you have links to the papers disproving that? That result is kind of the basis for the moral argument for allowing abortion for consensual fetuses for me. Without that result the cost/benefit looks terrible because the deflationary death spiral of the below replacement birthrate it helps cause is really, really bad.