Even the repetitive Sinification of the barbarian invaders who conquered China has a parallel in European history. The Western Roman Empire was overrun by various Germanic tribes. Yet after their conquest, they did tend to adopt a form of Roman culture that would define Western civilization. France, England, Italy, and Germany throughout the Middle Ages (and eventually Scandinavia, Spain, and the Baltic coasts as the era progressed) all shared the same common Christian religion, the heritage of the Roman civil codes, some Roman pastimes (such as bathing), the Latin language for ecclesiastical or administrative purposes (except where supplanted by French). This was adopted even by people who had no memory of the Romans, some of whom where even beyond the edge of the known world to the Romans.

The parallels aren't perfect, of course. But it should thoroughly dispel the notion that Chinese history is wholly unique and unreplicated.