Spurs would have to win out and then hope the Bulls get to 17 losses. Bulls own the tie-breaker with the Spurs.
It's within reach but out of the Spurs' control. Pop will certainly NOT overextend his players to accomplish this. It'd be great if it happens but not the priority going into this last week.
Do note that the Spurs play a Thursday game on the road and then will have to play someone at home on Saturday. Gotta believe Pop sits the Big Three (at least Tim, and very limited minutes for Manu and TP) for that Thursday game.