I am listening to tGS right now and reached the point of DarkRand's meeting with Tuon when she almost agreed to the treaty. When describing what he wanted he included the "until my death" line and the treaty circumstances seemed to match what we can infer from Aviedha's visions. Add to that the way he had been treating the Aiel, and the possible ramifications from it, and you could end up with a future scenario much like Aviendha sees.

Additionally, the timing of the meeting seems like it would coincide rather well with Avi's journey. I wonder if Avi is seeing the repercussions of what would have happened if Tuon had not been able to resist DarkRand, and by doing so she (Tuon) invalidated the future Avi saw. There is even a statment from Tuon about how everything has now changed. Maybe Avi's journey and the insight and determination she gained is what allowed (through the pattern) Tuon to resist DarkRand's "ta'veran gaze"

In my mind, these 2 scenes appear to have been disconnected by the editing needed to create 2 books out of the first 2/3rds of Jordan's original vision of AMoL. Perhaps the original scene plotting had Avi's journey occurring between 2 chapters covering the meeting (broken with Tuon's decision point as the cliffhanger), or in a chapter that occurs before it.

Thoughts?