A couple of thoughts:
First, I am of the view that within 10 years of victory over the COGA (the end of the last book) Staynair is going to step down as head of the Church of Charis. He'll still remain involved, of course, but I think that the inner circle will view the benefits of such an "early" retirement as highly beneficial. For starters, his successor (Wyllsyn perhaps?) would have the benefit of his counsel for a many years. Beyond that, if Staynair (as an Archbishop emiritus) travels the Empire giving mass and confessionals in many cities in towns it would be a visible sign of humbleness - more proof of the difference in focus when compared to the Temple. Going further, it would set an example for future Archbishops of Charis that they are expected to step down every "x" years, and return to serving the people. Basically, Staynair will always be highly involved regardless of his position - and in a time of peace it is a better long-term strategy for him to step down early and name a successor (lead the process of appointing a new head of church) - while allowing him the freedom to spend more time as a simple priest teaching and healing the people.
Second, I think Ducharin dies very early in the next book. In fact, as it seems the discovery of the Book of Schuler is what creates the next crises, I wouldn't be surprised if that discovery leads to a heart attack. Depending upon what the Book says, such a double-blow to the COGA would be more than enough to create a planet-wide crises.
