I updated my post, there're lots of info in amazon article.
Now it's like 99% that it's a ballad song with a death theme.
I love Fix You, Kristy, Denial, Dirty Magic... I'm a sucker for slow offspring songs.
The theme of this song has totally something to do with a subject not allowed here. I've been getting this vibe for quite sometime now. Pretty much like Fix you; boy, do I hate Dexter's voice in the song during two of the verses. If it weren't for that I would love the song.
Considering what you're discussing is really just recycling the same old rumor that's never been confirmed by anyone in or associated with the band, I'd say saying you "know" would be a gross overstatement.
I Agree, lots of speculation, lots and lots and lots
The End of the Line is about Davey Havok faking death.