I don't want it to end this way either, but part of me thinks it is possible given the story we've gotten so far (though it is extreme). I'm very happy you still see Sam within this screwed up mess of his brain. What's ironic to me? Is that Dean loves him so much, and fears Sam's destiny so much, and yet the things that have happened to Dean because of how he loves Sam can beat Sam down and ruin what he IS. (A little convoluted, that. But.)