The fact that Jazz has gone from +4 to -2 should be a confirmation that the big 3 for Spurs are not playing. This is clearly one of those games that Spurs do not care about and are willing to lose. Almost exact situation a while back happened when they went to Portland and got blown out. And I think given that Jazz are on a playoff hunt, they will look to pounce at the opportunity and should win this with more than 2pts easily.
I don't see any reason to believe that a strong Jazz team at home can't beat Spurs without Parker/Duncan/Ginobili. This should be about as easy of a play in the NBA as we've seen in some time.