On the one hand, you are right, no success happens in a vacuum, and a lot of wealth is acquired directly through a good ol' boys network.
On the other hand, most successful entrepreneurs probably deserve credit for building a company no matter how many people help them. Aside from being well-compensated in many cases, it's a tenuous argument that the employees of a successful startup would be creating the same amount of value without the inspired leadership and focus created by the entrepreneur.
I don't think the statement: "all we've done is shift nobility from something granted by God to something granted by monetary wealth," is fair. Clearly society distinguishes between inherited and self-made wealth. The question of who deserves what is subtle, and I'm hard pressed to come down on one side or the other.
Which, when you think about it, isn't too far off from the old notion of the "nobleman" -- all we've done is shift nobility from something granted by God to something granted by monetary wealth.
(also, since the article contrasts the modern era with the old hereditary aristocracies, take a look sometime at how many prominent Europeans today are descended from or associated with descendants of the Habsburgs and the Bourbons, or just how incestuous US government has been over the past fifty years)