If Favre comes back...?

What happens if Favre has another 29 int season. He doesn't want to end up like Dan Marino and retire after one of his worst seasons. Everyone says hes the best thing for the packers but who is to say aaron rodgers won't be better than Brett Favre. Favre should end his career on this last season because he can end on a good note. He can walk away from the game with his head up instead of his head down or being carried off on a stretcher.