I think one of the Malfoys (probably Narcissa) will betray Voldemort in Book 7, and it will lead to his eventual defeat. Throughout the series, Dumbledore has continually made the point that love is powerful, and that Voldemort's weakness is that he fails to understand this. In ordering Draco to kill Dumbledore under the threat of killing his family, Voldemort has set up the instrument of his betrayal. If, in Book 7, it comes down to a choice between her loyalty to Voldemort or the life of her son, Narcissa will choose Draco. Similarly, if Draco is set up to choose between his family and Voldemort, he'll choose his folks. He showed this weakness (a weakness from Voldemort's perspective, anyway) when he couldn't kill Dumbledore in the tower. Snape got him out of that jam, but I'm sure the issue will come up again in Book 7.
Thoughts?
I don't know. Her name alone (Narcissa) leads me to believe that she wouldn't sacrifice herself.
Who knows. Your theory is as good as anyone else's!
I agree here, but we don't know what is happening to Draco now. He was unsuccessful. Draco can't hide his mind from LV, but Snape (if he is a good guy) surely can. Will the Malfoys end up being protected by the Order?
Exactly the kind of sacrifice that prevented VM from killing HP in the first place. Very interesting, indeed. I wonder if someone is going to bust Lucius out of Azkaban and if so, how will he react to his son's inability to follow VM's orders? I can't see him choosing his family over VM. Lucius is pure slime.
Someone a few comments back mentioned that perhaps DD sacrificed himself to add to Harry's protection he received from his mother. Could it be that he was actually imparting that sort of protection upon Draco?