I know this has been a topic of discussion lately and there have been rumors flying about a sixth season. I have to say from a writer's point of view if season 5 were the last I would be a bit pissed off. Number one we've met the devil, but haven't met God. I'm not buying the whole god is dead bet. Number two sam and dean are bound to give in eventually. Even if dean doesn't what's to stop micheal from talking some other shcumch into saying yes so he can smack some sense into dean. There are just to many plotline that need solving plus the whole apcloapsye thing hasn't been played to it's full potential yet. So it would be way to easy to drag this on for another season even two. Just saying if I were working with those guys there's no way I'd let this be the last season and as for season six. That would be a question mark. Would the plot lines finally solve themsleves or lead into another season? Think of these things when asking are they going to do another season.