Oh god, no. If they were to do that they would have done it along with Bretonnia and the Tomb Kings, not 3 years after and after giving them support with the GHB for 2 years.
Do you even realize what you are saying? You are saying it's completely acceptable and even good to trash an entire faction that has been present both in rules and in fluff for the entirety of AoS to replace it with a faction that shares those rules and fluff but it's models don't have spiky armour. Darkoath ARE Salves to Darkness, even GW has said so, they aren't rebooting anything, just updating some old models to the current standard. You speak as if every concept derived from Fantasy was flawed and had to be completely and fundamentally changed for no reason. StD are Archaon's army, in their entirety, even the marauders and the tribes. Even in fantasy, the tribes ere"mortal-tribesmen-who-don't-quite-realize-they-are-bad-guys army". That concept is already in StD, it makes no sense to separate them because they are the same thing, just a bit closer to the final prize in the path to glory.