As the linked article is actually saying: Inside businesses, there's a tendency to assume success is luck or "I'm just such a genius." The question "where did we go right?" is too infrequently asked. Perhaps it is luck or it is genius, but there's never a postmortem to answer which and thus better plan for the future.
Examine success as much as failure
Usually it is better to examine failures more. This is partly due to the asymmetry between creation and destruction. Only the paranoid survive. This is also why people tend to have bad dreams.
Harvard Business Review has posted something right up our alley: "Why Leaders Don't Learn From Success"
Also, the HBR essay links to a similar discussion of how Pixar avoids being brainwashed by its own success (something I had always wondered about - they seem too consistently successful): "How Pixar Fosters Collective Creativity".