Henry J. Kaiser also did it all. Kaiser Steel. Kaiser Motors. Kaiser Permanente (the cement company, not the hospital company). Kaiser Shipbuilding. Kaiser Gypsum. All gone now.
Musk might not care if Tesla and SpaceX disappear if electric vehicle mobility and affordable transport to Mars is achieved. They are a means to an end.
He has said multiple times that he thought the likelihood of success for each of Tesla and SpaceX was less than 10 percent, but that was ok, because even in failure, they would 'move the ball forward' on sustainable energy and making humanity a multi-planetary species.