Xenophobia drives social movements that enforce hierarchy. And rich people afraid of being less rich will bankroll and support these movements since they’re at the top stratum.

But then pluralistic social movements value equality, law based on principle (rather than loyalty and tribute) and this promotes commerce and culture.

So we have social forces that tug society in their respective directions.

Eventually plutocrats will develop technology that allows then to control and contain the masses, and prevent popular movements from taking hold.

Or, eventually we’ll make the plutocratic class impossible, and keep tight reign on the political class to keep them from seizing too much power (or using it for narrow interests). One or the other.