Here is Chris Leinberger opinining on little evidence over the "Death of the Fringe Suburbs" in the NY Times. He also offers a novel explanation for the economic downturn: "It was predominantly the collapse of the car-dependent suburban fringe that caused the mortgage collapse."
But here are the last decade's fastest growing counties in terms of housing. Granted some of the new houses are empty. But here are data for population. Most of these counties are the fringe suburbs.
And I had previously cited Wendell Cox's report of census population data for 2010 which show continuing suburbanization.
Arguing from data beats arguing from wishful thinking.
Data from Joel Kotkin