Do they not? This seems like part of the massive assumption that I frequently see cited here, and basically never see in reality. There are two places where transplants actually seemed really detached from natives, and actually likely to leave within a few years, the military and universities. Outside that, my federal agency is filled with people who are transplants and havent left for 20+ years and will die here, and natives of many generations to dc. The notion that there aren't native dc residents in the largest and most geographically stable industry in town is mind boggling to me, and completely unsupported by my own experiences. Where do people think a massive chunk of the recent black Middle class works?