What do you mean? Almost everyone wants more, and will gladly take it if they have an opportunity. That’s why lotteries exist, right?

Big history is full of open questions, but there’s counterexamples. Short-lived republics are a dime a dozen, while Egypt lasted for thousands of years. There are known cases where inequality actually increases with the end of an empire, like how Roman Britain with it’s public bathhouses directly gives way to dark ages Britain with feudal lords and manors. In some cases, a disenfranchised group getting a bit of power is destabilising.

Yeah, “people used to be better” has been a popular sentiment since Socrates, at least.