"The Veden and the Alethi are good at strategy and battle, and have Oathgates and Radiants. Fullborn are rare, yes, but if entire societies became focused on trying to beat the Channelers, Steel Inquisitors and extreme Hemalurgy would almost definitely come back, as would Kelsier and Marsh." Tani considered for a bit. " Steel Inquisitors might not actually have to come back, because Kelsier made the Bands of Mourning and could certainly make more metalminds like it. And if it's the whole Cosmere, you have to take into account Kalad's Phantoms, all the Fused, and all the discoveries of all the scholarly communities, which means Aon Dor could possibly be powered by Stormlight, and work effectively, even far from Elantris"