I'm not sure that I agree. While I would support something like outlawing billionaires or at the very least, a tax bracket that claws back significant chunks of what they are draining from society, there are vast nuances to these issues beyond "the billionaires want it that way." When you say "everything from ... can all be rendered down", I think it's pretty important to recognize how much detail and nuance is lost in that rendering down.
Billionaires and the accumulation of wealth are just stand ins for the accumulation of power in a capitalistic society. When power is removed, it creates a vacuum. Who fills it? In the ideal, I know most of us would say "the people" but this is an insanely complex balancing beam to maintain without some group of assholes finding a new, non-capital way to extract and centralize that power.
None of this is to say that eliminating the notion of a billionaire is a bad idea. I'm with you all that the very idea of a billionaire is heinous and impossible without vast exploitation. I just do not think that issue being solved would be even close to some panacea for all of the world's problems. There would just be twists in the existing problems and fun new ones.