Keep in mind that that number could easily be exaggerated for dramatic effect as a deterrent for future ambitious peasants. Also, just because that particular event didn't lead to sudden change doesn't mean it ended the struggle. Eventually, feudalism did indeed come to an end.

That being said, millions die every year due to the depravity of capitalism. Yet, in the west, nobody bats an eye. we are still well insulated compared to the struggles in the global south. They have been fighting for decades already. The pace of change is quickening day by day.