It the majority of the citizen's are not invested in the society it will collapse. Social mobility and the promise of a better tomorrow is what keeps people going.

If your society sucks so much the idea that "Hey, maybe the barbarians aren't that bad" begins to take hold.

Cortez did not defeat the Aztecs because of guns and horses. The Aztecs had been abusing the surrounding tribes for years and the surrounding tribes were fed up. When Cortez showed up with guns and horses the surrounding tribes decided to throw in with him to overthrow the Aztecs.

The Republican party is no friend to working people yet, many working people vote Republican because the Democratic Party has abandoned them.

If the fruits of AGI/ASI are not shared with working people, expect societal collapse or at least an authoritarian government.