I think you have some pretty interesting interpretations, and I agree with a lot of them, but when he says "this trilogy" he is definitely referring to the prequel trilogy. If you watch the documentaries in The Phantom Menace, it shows a day in the life of Lucas from 1995, taking his kids to school and stuff like that. It was, specifically, the day in 1995 when he first started writing the script for The Phantom Menace. So it was definitely in his head at that point.