I think the Spurs don't care about the total # of wins , they just want Homecourt advantage throughout the whole playoffs.
I think they will win like 63-65 games this year, keeping the HCA during the playoffs. And people saying last year that the Celtics would lose in the first round of playoffs because they are old, and look, they almost won the title. And still this year are at first place in the East. Duncan is going to be ready for the playoffs, he is getting a lot of rest this season.