He is planning future impact on the city. He is asking how these lower income areas maintain such a vibrant public life despite having little money. Whereas areas with a lot of money to do what they want haven't fostered the development of "community.
He does this research, it is debated, councils planning for future development take aspects on board and the city develops as a whole in a more positive manner. He is, i feel sure, advocating the spread of what he sees in the poorer neighborhood to a greater area of the city. This is positive. This research and research like it is a part of the reason that parks like EMB, designed by Laurence Halprin a landscape architect and theoretician, and Pier 7 get designed. Theory and research is also the reason they get designed in different styles EMB - modernistic, Pier 7- Contemporary/post-modern/art as place.
He is in no way advocating putting money into richer neighborhoods, this is more of the cities future as a whole.