Exactly what happens to all of the Turnedj post TG after the Dark One is sealed away?  I would imagine that they wouldn't automatically revert.  Plus, could it be possible to "re Turn" those people to the Light?

I think they would die, or go mad, as I believe the Dark One's touch upon the world is what sustains those people.

I don't think that they would die. And according to RJ, they CAN go back to the Light, but there is no One Power weave that can do so, they would have to willingly go back and repent. According to the same RJ answer, that is nearly impossible since the Turning process massively diminishes such conscience, if not removing them. Permanent imprisonment in a stedding is the most humane choice. If not, mercy killing

Well with the DO gone they won't go mad.  Nyn maybe can think of something but it seems as if their free will is gone.  So my guess is chances are slim they can be cured.