In modern times the traditions of the past remain even after the natural barriers of communication time and mobilization speed have been eradicated by modern technology. The rules of the past become a part of the culture, language, and customs of the people, even after they are theoretically obsolete. Finally, there is a natural fear of retribution you see when a minority oppresses the majority for a long time. The minority doesn't want to be treated as they treated the majority for so long, and are terrified that if they give an inch they'll find themselves hanging from a pole just like so many of their victims.
In a world like today, are you blaming people moving to other regions just to get jobs? Because that is what happens in China and else where in the world. It has nothing to with “getting rid of minorities”.
This sort of thing has had a lot of pushback lately from well meaning but IMHO misguided folks who complain about "cultural appropriation".
You aren't asked to forget your cultural traditions, you're asked to bring your neighbors into them. To share the culture. But also to admit that the edges are probably going to be sanded off and you're going to see people from outside of your group participating.