For decades, Chicago’s infamous Cabrini-Green high-rises — with their fenced-in balconies and horrific high-profile crimes — were a symbol of the failure of public housing in America. Their closure this month ends an ugly era. But for the last of the Cabrini residents moving out, the shuttering also marks the start of an uncertain time. While some families who have already left the complex are faring better, it’s still difficult to track whether the plan to overhaul Chicago’s public housing is improving the lives of those low-income families relocated.