This is an interesting discussion going on at Veritaserum.

http://www.veritaserum.com/forums/index.php?showtopic=4335

Surprisingly a lot of people support this theory, but then Harry would have to die, wouldn't he? I don't like that ending. Although it would end the Harry Potter series, and book 7 is supposedly the last book. I'm not ready to consider this myself, but I thought I'd throw it out there.