What is the expiration date on our Offense?

How much longer do you think we will have a potent offense? I ask that because obviously we are going to pretty much start over on D. So how long of a Super Bowl window do we have? As long as Brees is a Saint I think we should be in contention on that side of the ball. I am not sure how much longer Reggie will stick around. But Colston should be around a while if we are smart. I think most of us agree that we won't win a Super Bowl with our current defense, but maybe with an offseason or two of good moves on the defensive side of the ball, we can be in the running every year. I would hate to see the D come around just in time for us to sign another Billy Joe Something at QB.