I think the intent of the author was to break that cycle Jerz mentioned, although I think he unintentionally did a terrible job of doing that.
His main arguments can be summarized as such:
1) the education in all MBA schools are similar
2) therefore you can find qualified guys outside of the UE and Es.
I don't disagree with those statements at all, however I did he miss the mark here. If I'm a HR guy for a very desirable company (e.g. Goldman, Apple, etc.) I need a good reason to go recruiting off the beaten track. Say I plan to recruit 10 MBAs this year, and I already get 1000 applicants from the top 10 or 15 schools, what's the incentive for me to go looking harder? By saying "Hey, we're good too. We received the same education, we also have qualified people, come take a look!" isn't really going to help. The HR guy is probably going to think, if they are all about the same, skip the risk and recruit only at the premium schools. The risk to reward ratio is terrible using the author's logic. The HR guy is going to keep thinking "No one ever got fired for hiring a Harvard guy."
IMO, I think for the lower ranked schools to move up, they should actually seek to differentiate themselves, maybe by specialization. Instead of saying "We're the same as the M7 schools!" perhaps a strategy that says "We're not as good as the M7 schools, but in Finance (as an example), we're just as good as Wharton/Booth/Stern!" might be more effective.