&#x27;Reconquest&#x27; of city&#x27;s has far more components than most people assume.   Gay community who mostly don&#x27;t need good schools.  Bad traffic to make suburbs less appealing. Video Games to keep young people entertained and not out damaging the community.  Vastly reduced Lead levels to reduce violence.  Reduced pollution to make city&#x27;s livable. etc etc.  Even the loss of manufacturing and retail jobs has been a net gain for city&#x27;s.<p>It&#x27;s far from any one thing.<p>PS: And if you want to go far afield reduced threat of nuclear war making city&#x27;s a viable place for your population.