Super job on the comments. Here is some reaction.
1) It will be hard for PJ to have a long tenure because that is the reality of the NBA
2) The Spurs have been as good offensively as they have been defensively over the past years. I love the Spurs and think they should be the model but the Spurs aren't the Spurs because of a model they are the Spurs because of Duncan.
3) It is going to be a huge challenge to get this team to play well defensively. They are so young and very fun young players are good defenders.
4) The real issue defensively will be Robert Swift. No team is good defensively unless they have a 7 foot anchor.