Here are potential benefits I could imagine for such a tool:
-Aggregation and use of sound content (e.g., resources like Concordia Pulpit and Pulpit Resources could be used to train the generator; historical sermons by Luther and other Fathers, too).
-Auto-outlines of a text showing potential ways to preach it as expository, thematic, biographical/story approach, etc.
-Cross application of illustrations to multiple texts and themes.
-If linked to the web, such a generator might automatically line up related news stories, historical examples, literary references, song lyrics relevant to the target listenership. Imagine telling it you want three illustrations, suggestions for which are best, and a list of options.
-Potential reduction in time spent on creating content.
-Potentially greater style variation so sermons sounded fresher.
Instead of one pastor grinding out one outline/sermon, what if that pastor was presented with a handful of approaches to the passage from which he could choose what he believed most suited to the congregation he serves?
These are some ways AI technology might serve sermon development.