Charles-Henri saddens me. It's like... like you can't give him anything. You can't give him love, can't give him respect, can't give him status or it will break him. He can only feel bad things or else he over-indulges on the good ones. Now, he's not merely a pawn of the system, he's somewhere in-between his old self and an actual perpetuator of that system.
Is he gone? Probably. And well, we know he's going to cut the heads of both Marie-Antoinette AND mrs du Berry, so nobody knows how he develops beyond this duel. There's no way of him and his sister ever seeing eye-to-eye now, but maybe, just maybe Monsieur de Paris can open his eyes again.