Since May 1, Hoffman has a -1.1 WAR with 27 saves (7 BS), and a 6-7 record.
There's a monster sample size to suggest that he's been hurting the team for 5 months, and they haven't changed anything. They won't use him today since they have avoided using him 3 days in a row all season, but no chance he's being taken out of the closer role now, IMO. I hope I'm wrong on that and Schneider uses matchups in the 9th inning more often, but I don't think he's that type of manager.