Basically we redistribute most of the wealth we confiscate from the millionaires to the working class, give the billionaires their pound of flesh for financing the revolution, and we banish the billionaires to a bunch of little special economic zones on islands and shit where they can do neofeudalcapitalism or whatever, but only there! The rest of the world transitions to communism and we let the next generation deal with the billionaires we made a Faustian bargain with.
We should basically do to billionaires what they tried doing to Napoleon.
Because there are a lot of them. The billionaire types also all supported fascism, they just couldn't be the main base of any movement because there were too few of them and they don't get their hands dirty. They just finance the rise of fascism.