That BS has said that ToM might become even longer than TGS, maybe around 1000 pages. I also think that it was stated that AMoL won't just be about TG, but that TG will start somewhere in the middle of the book. If that is true, BS would likely have around 1300-1400 pages to deal with most of the remaining storylines before TG (and some storylines might anyway remain open).

I forgot about the ogier stump, and there seems to be something going on with the tinkers, also Avi's trip to rhuidean. I think many, if not most, of the viewings and dreams and prophecies take place during the course of Tarmon Gaidon. Egwene's Seanchan lady helper, could easily be during, or perhaps after the battle when the White tower tries to reconcile with the seanchan. if things happen as quickly as they did in tGS then one book should be enough, 1 and a half more than enough.