I have to say, the pro-AA people made very few good arguments in this post. There are plenty to be made, and simply none were. Pointing out examples of success, or using ad hominum attacks, or just citing the vitriolic posts of the anti-AA people as a premise for your argument does nothing to counter the article in question.
Furthermore, with regards to elite law schools, many more people could do well at Harvard than get in. Hell, if you get in to a top 25 school you could probably handle the workload at Harvard. That is not the main point though, nor is it the argument anti-AA make regarding why AA shouldn't exist. Step it up