Me and my friends-and some more BWWers- think that HARRY himself isn't the horocrux, but the scar is. Thus the scar can be removed while Harry can still survive.
Rosencrantz: "Be happy - if you're not even HAPPY what's so good about surviving? We'll be all right. I suppose we just go on."
- from Tom Stoppard's Rosencrantz and Guildenstern are Dead