Duncan's box score statistics, once you rate them per possession or per opportunity, haven't changed much at all. When you hear Tim's name mentioned, it'll continue to be about his "worst year", single-digit this and career-low that, but it's mostly an effect of fewer minutes and touches. If there's any decline to be found in the statistics, it's in his less efficient and rarely used post game. Considering how steady Tim Duncan is in other facets of the game and how important he still is to the team, I think you can say reports of his demise are greatly exaggerated.