Recently, Elon Musk's ex-wife Justine Musk answers the question "Will I become a billionaire if I am determined to be one and put in the necessary work required?" You can read Justine's original post here on Quora. Here short answer - no.
"Shift your focus away from what you want (a billion dollars) and get deeply, intensely curious about what the world wants and needs. Ask yourself what you have the potential to offer that is so unique and compelling and helpful that no computer could replace you, no one could outsource you, no one could steal your product and make it better and then club you into oblivion (not literally). Then develop that potential. Choose one thing and become a master of it. Choose a second thing and become a master of that. When you become a master of two worlds (say, engineering and business), you can bring them together in a way that will a) introduce hot ideas to each other, so they can have idea sex and make idea babies that no one has seen before and b) create a competitive advantage because you can move between worlds, speak both languages, connect the tribes, mash the elements to spark fresh creative insight until you wake up with the epiphany that changes your life."
What is so insightful about her response is that the original question asked to her is fundamentally flawed. Of the world's 1,645 or so current Billionaires, never do you hear them actually talk about the pursuit of money. Click here for the full list. Instead, you often hear about an incredible pursuit of passion that in some way has benefited humanity or has progressively changed or transformed the "status quo" within an industry or spanning multiple industries as we know it.
So the takeaway from Justine Musk's response is that statistically, an infinitesimally small few will actually become Billionaires so stop aspiring to become one. Instead, focus on mastering what drives you, dream big and pursue that. We just might surprise ourselves at the outcome.