Run his course? He'll be 27. Why would anyone think this? Probably because he wasn't considered one of the top 100 prospects in 2005, as if that makes a difference now.
Because, while he's certainly a solid minute-eater, I don't personally consider Fayne to be anything special. I think he's a prototypical 3-4 D-man that has adapted to playing top-2 minutes in NJ. Certainly valuable to the team right now, but I'd hope in two years some of the prospects in the system are ready to move up and take his place.