Catholic Biblical Scholar, Michael Barber (John Paul the Great University) has made an extensive post on the subject, and looks at some possible candidates. It is largely believed that Mahoney's successor will be Hispanic given the large population. He digs into the background of three possible successors.
You might want to bookmark The Sacred Page and visit it for the biblical discussions there.
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The obedient are not held captive by Holy Mother Church; it is the disobedient who are held captive by the world!