The question asked by the book is whether New York can maintain a culturally unique and compelling identity. Or perhaps it will just become like Anyplace USA? Here, suburbanisation is not taken as a compliment. The text suggests that homogenisation is a real peril. But that New York will still, somehow, retain enough of a global cachet to remain on the cutting edge of cultural and fashion trends. The arguments pro and con are not conclusive. Somewhat vague to measure, on either side. Readers from more quantitative fields may wince at the sheer qualitativeness and ephermeral nature of much of the arguments or trends.
Still, at least the discussion is interesting. Lets you step back for a while from current events and try to discern broader long term patterns.