He's got about 5 million reasons to want to be a head coach. Say what you want to about his family being wealthy, but if I were him, I'd want to make my own money and have my own success regardless of what my dad did. In fact that's probably something that drives him to succeed.
People seem to always assume that his opportunity came because of his dad, but he really seems like the kind of person that doesn't want that at all. And his success has absolutely nothing to do with his families money.
He seems to be the type who wants to make his own path, own money, and own success. There's a reason he went into coaching and didn't go to work for FedEx or some other company his dad probably could have gotten him a job at.