21 million billionaires is better than the 3,000 we have today. Wealth distribution will still resemble a hierarchy but orders of magnitude more fair than today.
Discussion
if the money printer is desteoyed, then the inequalities tend to lower with time cause you cant "spend free" and "make money spending" unfairly selling debt. You spend the scarce resources (transferring wealth to someone else) OR you conserve wealth not spending.