Benedict's resignation forced the church to allow something that has been thought unacceptable for centuries, setting the stage for his predecessor to do likewise.
With the concentration of power in Rome, perhaps the responsibilities of the papacy are not simply too much for a person of Benedict's age, but for any one person.
Four contributors, all of whom wrote for a previous series called "What Next?" which reflected on the start of Benedict's papacy, now reflect on its conclusion.
