I completely agree with this article. I'm a successful entrepreneur with an Ivy degree, and I've spent a lot of time with Entrepreneurs from around the world. A surprising number didn't go to a 'top-tier' school; by surprising, I mean to say that where I live if you throw a brick at a law firm, marketing agency, publisher, or accounting firm, you will hit a bunch of Ivy grads. If you throw a brick at a successful startup-CEO meet-and-greet, you will hit a bunch of immigrant kids, local 'townies', and 1 time in 15, someone with an MBA, (usually from a top school.) This is so prevalent that at a recent dinner I had with a highly successful real-estate developer, I was shocked to learn that he went to Harvard. I expected him to be a local non-Ivy grad, given his huge self-made business success.
I've come to a similar conclusion that the author of the article does: risk-aversion is real, and prevalent for Ivy grads. This is probably for a mix of reasons -- I could imagine wealthy students not 'needing' the success as much, and poor ones saddled with loans which make risking much harder. I started out in a risk-averse career, management consulting, but I just couldn't hack the lifestyle and people, and left to do something that was crazy and eventually much more lucrative.