If you don't think a shotblocking paint presence like Camby wouldn't help the Cs dramatically this year, I question if you've been watching the Celtics play this season (worst rebounding team in the league combined with butter soft interior defense.)
The Cs desperately need a big if they're going to do anything besides go home early in the playoffs. If the cost is a late first round pick that probably won't end up being much of an NBA player, I take that shot.
In the playoffs, with no back to backs, the Cs could be very dangerous with a healthy Camby patrolling the paint. Add Camby, and hope that MP3 is hot from 3, and the Cs will be a very difficult out.