I feel like this may have been a topic on the Planescape mailing list or Planewalker before the crash... but I've been wondering what are the outcomes of the official adventures (assuming PC success)?
The Eternal Boundary - The Illuminated pretty much cease to exist after the PCs nuke their base in the Plane of Fire (save for their leader Green Marvent who is in the Outlands).
Well of Worlds
In the Abyss
The Deva Spark
Fires of Dis
Doors to the Unknown
The Great Modron March
Tales From the Infinite Staircase