What is a bit more surprising is that it won't take long post TG for the channelers to realize two channelers always produce a channeler, and for channelers to favor such unions (conveniently, most AS and a great deal of Asha'man are single...). In fact, the White Ajah already deduced that, they just couldn't make anything of their theory (except for BA Whites sparking strife and dissent by bringing up the idea even though it was non viable, which Alviarin precisely did.. with Sheriam fuelling the fire by accusing the Red of culling out the ability and Verin also involved in the debates...) because they feared producing some male sparkers (a PR fiasco) and increasing the odds of male sparkers in the general populace.

But not long post TG the channelers will know, and facing the Seanchan as they do in Aviendha's version of the future, you'd think they care to preserve the channeling lines as a matter of survival. But in Aviendha's future it seems the BT/WT have not reunited either. For that matter, it sounds like the world isn't united for very long to face the Seanchan. Aviendha's vision is really like a series of missed oppportunities and bad choices, there's more to it than the Aiel resuming the war.