I think he's one of those characters you know is never gonna die, like they're in these life threatening situations but all you can do is wonder how they get out not if they're going to live
I really dought this is Vaughns last season seeing how he has a contract for at least six seasons. And if they did decide to kill him off for some reason they might as well just cancel the show as well! I think as long as Sydney is on the show Vaughn will be to. I look at it this way if they can't be together in real life at least i can see them on the show tegether.