Take Elon Musk for example. His vision of the future is more compelling than anything I hear any politician of any political party in the USA (or most other nations) putting forward. I find the standard issue right-wing vision of the future repugnant and the standard issue left-wing vision completely impractical and divorced from reality. (Aspects of it are repugnant too, but much less so than the right.)
What other non-billionaire visions of the future does humanity have? Xi Jinping's smile-or-die panopticon? Putin's theocratic mafia state?
The billionaires are leading humanity by default because they're on balance the only class of people offering practical workable visions of the future that are at least incrementally better than the present.