I'm not that worried.
1) I do think the team is tired. While I support Danny resting Shaq, BBD, and West to some extent, he also needs to ask himself at what point is overplaying the Big Three more of a detriment than not having those guys at 100% for the playoffs. Still, if those guys get back soon, it's a moot point.
2) I do think the team is a bit indifferent. And I think that's a product of the aforementioned stance by DA and management. It's awfully tough for a team to leave their heart on the floor for a game like this when management is sitting players that they are openly admitting would be playing if it was a playoff game (i.e. an important game).
3) I think the new guys hurt lack of cohesion hurts. That should improve. More importantly, most of the guys who got minutes tonight likely won't sniff the floor in the playoffs. I could see Murphy and/or Pavlovic not even making the active roster, Arroyo won't likely see the floor, and even Krstic could see his time dramatically cut (if Shaq starts, Baby plays some 5, and/or JO comes back).
This sucks, but after last season, I'm not willing to raise an alarm.
However, I hope they don't blow the #1 seed and have to play the Sixers again. We'll beat them; however, a team like the Pacers will be much easier.