Spoilers
Avienda’s future vision means it is possible.
Tuon could maintain the peace her whole lifetime. As in the “dream”, it is her child, or their grandchildren that take Randland down that path.
All the power in Randland means nothing if it isn’t unified. Galad’s death means Berelain won’t marry into Trakand. Any Andorian alliance with Saldea cannot involve Saldea leaving the border to defend Andor. The only true Alliance that can survive a generation is the Andor/Cairhien super country.
Avi’s vision is telling what will happen, not because it must happen, but because it always had. Hawking’s death lead to the collapse of Randland. For the Wheel of Time to turn, society must collapse or the Wheel will stop turning.
I never liked Asmodean. He never converted to the light.
At the end of the second to last book, (Spoilers) when Rand has a dream with Meirin, I believed her.
I think Sanderson only flubbed part of the first book he wrote. When he first tried to write Mat, it sounded a lot like his fun/silly Librarian books.
After that book it was much better.