User blog comment:TemTheory/Season 15 Theory/@comment-3045936-20190503043144

Two possible plots.

1. God is killed but his power isn’t lost and is fused into Heaven. Thus permanently preventing its collapse and keeping reality in place.

2. It is a complete retcon of seasons 6-15. Meaning when in season 5 finale Chuck is ambiguously revealed as God, he is seen finishing his story. So maybe the season 6-15 were just rough drafts that never happened and is revealed he is working to make a better story after Swan Song.