Economic vitality may rely on a fast-paced lifestyle of risk and reward. But the creative class of one generation gives way to the next when they burn out and seek refuge in the suburbs. Just ask city pastors. This is the problem they struggle to solve. Turnover gives urban churches wide national influence. Ironically, it also undermines local community. So the very bonds of fellowship that attract young people to urban churches in the first place eventually dissolve when members lose their resolve to stay in the city.