Using similar logic, it is also reasonable to state that the following players WILL be healthy:
Ray Allen
Paul Pierce
Kevin Garnett
Rajon Rondo
Glen Davis (despite his current injury)
Nenad Krstic
Jeff Green
Carlos Arroyo
Troy Murphy
That's 9 players making up a pretty darn good team.
Sure, something can happen to these 9, but just as likely something can happen to Lebron, Dwayne, Chris, Dwight, Kobe, Pau, Tony, Tim, Dirk, Carlos, Derek....
There are 3 Celtics players in question: Shaq, DWest, and JO.
But... it really boils down to Shaq, doesn't it?
Shaq, who I don't think has missed a playoff game in his career. Shaq, who started 36 games this year. Shaq, who assimilated with this team in a heartbeat. Shaq, who is rested and in training and who will play through just about anything he possibly can once the playoffs begin.
Shaq may not get or stay healthy, and JO may never play a minute, but I hardly think it's the done deal proposition suggested by this thread.