I still think people are getting bogged down in details here. Here's the simple breakdown:
We may indeed miss Perkins in the playoffs since we're now putting all our eggs on 39 year-old, 350 lb. Shaq and JO's surgically repaired legs to carry us to #18.
However, while that is a MAJOR concern, that doesn't mean that Perk had magical fairy teammate dust that made everyone play cohesively and hard every night. The plain facts of the case are that a) this team did just fine without him the first half the season, and b) mailed the last 2/3 of the season in last year with him around. So to pretend that the last two months would've been radically different if the trade hadn't gone down is just ignoring everything that's happened to this team the past two years for some sort of romanticized revisionist theory.
Again, those mad with the trade may indeed prove to be right before all is said and done, but that doesn't mean that Perk was the panacea for all of our problems the past two months.