One idea I have not seen discussed much (although in all honestly I have not looked very hard) is that the One Power/True Power will be inaccessible at the end of the "last" battle. This would neatly resolve the main impediment to Seanchan integration, as well as give rise to a new, more egalitarian, "age of man." Whether the wheel is broken forever or not, this is an entirely plausible (and I'd argue elegant, symmetric, balanced) outcome. There have been many suggestions that the Dark One is entirely unknown in some ages (turnings of the wheel), but not a single suggestion that the One Power/True Power is always accessible. To know the former implies that you should be able to know the latter if it is, in fact, true. The lack of tacit reference to the One Power/True Power in all ages suggests, to me, that this more balanced final scenario is the most likely one - it would certainly be the most bittersweet.