I would definitely add Bezos to this list. However, Musk is very good at getting one thing going and turning to the next, while people like Bezos, Gates, Jobs have a narrower vision and pursue it without straying aside (actually jobs did with Pixar). Or perhaps it only looks that way because IT is such a broad field (and the iphone is as close to apple tv as tesla cars are to spacex rockets?).

OTOH, do you really need to be a billionaire to do "cool sci-fi shit"? Arguably, Musk didn't get rich with amazingly cool stuff, he just got a bit luckier than most people with the valuation of Zip2 and early PayPal.