I found this thought provoking. What happens to society with no more shared culture? Or is that silly because there is still so much we have in common (health, school, grocery shopping, being part of a family, etc)?
It falls apart due to isolation and lack of trust in fellow members of society. Robert D. Putnam talks about it in his book "Bowling Alone", the more different cultures come into a neighborhood the less trusting the neighborhood becomes and the less people go out and socialize and build relationships.