I love Perk and am sorry to see him go, but I think some folks need a reality check.
Perk has only played 12 games this year. I believe Boston's record in those games is 7-4. He's started only 7 games this year and I think the Celts have gone 4-3. The team went 34-10 without him playing a bit. That projects out to the Perk-less C's winning 63 games.
The upside of this trade is obvious. Boston gets a very good player in Jeff Green for this season and the next to ride out the end of the New Big 3 era, then can either resign him or let him walk. It also eliminates the need to tie up 10+ million a year in salary cap room in resigning Perk long term.
The downside is also obvious. If Shaq and JO aren't reasonably healthy for the playoffs, Boston better hope they don't have to face either Orlando or the Lakers. I don't think missing Perk would be a determining factor in any other matchup.
Mike