If you love cities, this is a week to rejoice. Now that the stadium planned for New York's West Side is dead, no one can fantasize anymore about the Olympics coming to New York. If the city had gotten the 2012 Games, its leaders would have basked for seven years in Olympic photo opportunities, and mayors across America would have watched enviously. They would have succumbed further to what I think of as the Circus Maximus syndrome. The victims of this urban-planning syndrome believe, like some Roman emperors, that a leader's prime civic responsibility is to build entertainment palaces for...