Wrathion is an interesting character with a lot of potential. They've built him up pretty well. People have been interested in the purified whelp from the Badlands qyest when it was first introduced, and lots of people liked his development since. Considering all they've put into him, and how he talks about saving the world (if not just to save himself) I doubt they'd kill him off so soon. We haven't had a reason to kill him off, and they won't put one in this soon. Breaking some bottles in an inn and calling people idiots isn't enough to justify killing him in a filler raid, imo.