Like everyone else, I love Duncan. He's one of my all-time favorite Spur players. I'm eternally grateful for his contributions to the Spurs franchise and for practically carrying this team to their four championships. We were lucky to get him and without him, none of it would've been been possible.
That said, I don't believe any player is above criticism for declining productivity. I remember Tim, early in his career, stating that he "wouldn't be one of those players that stay in the game too long." Shaq said it too. They all say it. Yet, look what happens. Most of them DO stay too long. It's rare that athletes get to go out on their own terms. It's certainly understandable because sports has been their whole life.
Unfortunately for the Spurs and us fans, that superstar power forward, who dominated the compe ion, the one that we all knew and loved is gone. The Duncan we saw last night is more the norm, rather than the exception. That is the same Duncan who showed up in that 2010 playoff sweep versus the Suns. It's also the same one who got worked over by the Grizzlies in that epic playoff series upset versus the Grizzlies.
If Tim had a young, athletic, budding talent, to mentor - like he was to David Robinson - it could be easy to justify him continuing to play beyond this season. The fact of the matter is he doesn't have that - and the FO should bear the brunt of the responsibility, as a result.
The pendulum cycle of sports dictates that a team often must get worse before it can get better. After all, that's how the Spurs were able to nab David Robinson and Tim Duncan in the first place. Getting a superstar is no easy task and the Spurs have been lucky twice. While it's unlikely that lightening will strike a third time, with a fairly high draft pick, they could still manage to get a good young frontline player to pair with Splitter to build around for the future. Duncan is still good enough to keep the Spurs a mediocre, fringe playoff team. Yet there is no upward development surge or high draft pick emerging from that.
I'm not advocating that he needs to retire, however his diminshed skills and inconsistent production would certainly indicate that he should at least consider it. All I'm saying is that the longer Duncan plays beyond this season, the longer the organization will be delayed from "turning the page" and starting the process of bottoming out and then getting better.