... but whatever happens will probably depend on the willingness of the “salad components” to unite when juxtaposed by circumstance.
Full self segregation, while legally permissible, is probably socially unhealthy. The trick is to emphasize policies that encourage (but not force) self segregation to minimize if not disappear.
The one thing we all have in common is the desire to be free and to retain our natural rights. These natural rights are enshrined in the first ten amendments to the Constitution. If we hammer on individual rights and insist on their survival the society will eventually homogenize.