While government-sponsored redevelopment has clearly affected the rate and density of infill in certain areas, the overall impact on the growth of the urban area is minimal. First of all, redevelopment affects only small portions of the metropolitan area. Secondly, it has not been very effective in creating housing. Increasing densities, on the other hand, would reduce sprawl. However, neighbors, neighborhood groups, and planning staff are unlikely to support higher densities.
Most people favor lower density life styles.
Even the Phoenix Infill Program subsidizes lower density infill by encouraging only single family, detached housing in the urban core. Given the constrains on the availability of land, widespread resistance to dense developments and probable lack of demand for dense housing, it is unlikely that any practical action by local government could affect the rate and density of infill enough to replace or greatly reduce the rate of urban expansion.