I think if anything, yesterdays game proves that getting rest is far more valuable than the negatives of not playing. At least, amongst very professional teams like the Spurs and Pistons. The Spurs were over the rust after 8 minutes. The pistons fatigue became apparent a few minutes into the 3rd.
The extra day is going to be very valuable for them and they need to get this next game. The Spurs really only beat up on the Pistons in one area, rebounding. I don't expect that kind of differential again.
This series has the potential to be a classic despite probable low scores.