Is there a need for extra motivation?

While John had some fun with Big Baby's inspirational words, I wanted to take a more serious look at motivational tactics.

I know the argument against motivation - "If these guys can't get up for a Game 7 in the Finals, then something is wrong with them."

But coaching is more than Xs and Os. It's about getting the most effort from your players (see Herb Brooks - "This is your time" speech).

Some players, like Ray Allen, seek out additional motivation:

"[Perkins' injury is] going to put fuel to the fire," said Allen. "I want to go out there and play harder just to try to get it for Kendrick, because Lord knows he wants to be out there. I hope he gets well soon. I love him like a brother. It's real unfortunate. I'm sure he'll be cheering us on in Game 7."

There's been a lot of speculation about Doc Rivers' future as head coach of the Celtics. If Doc has already decided that he won't be coaching next season, is there any value to telling the team in the locker room before Game 7?

Or... should he take a broader approach and say some of the guys (Ray, Paul, Thibs, TA, Nate, Quis) might not be around next season?