Not even then. Even if you look at the billionaires in their doomsday bunkers, their food supply will break down as well at some point after the rest of humanity succumbs to the climate crisis or the ongoing mass extinction event. It is impossible to decouple themselves from the fate of the working class, and the design of their lives is a delusion. Capitalism, no matter how you attempt to modify, reduce, or extend it, is inherently unsustainable in the long run