Thousand years of lie ! That's for sure there have to be a civil war or heavy riots from all sides. What's more, definately there will be factions that would want to take the reins of power. There are no concrete leader at the moment at Hishgard. The young captain, son of the then archbishop, would be a great leader of that nation but would he be strong enough to take that mantle ?
As for the scions, if Yshtola is alive, I'm sure the others are too. I mean, come on ! She made one hell of a sacrifice to use that spell on that fateful day !