I think this idea is really flawed on numberous sides. I dislike it so much I'm going to make a bullet point about it.
1) Honestly at this point in their respective careers I'd rather trade KG than Perk. Perkins is still getting better, KG is getting visibly worse each year.
2) Perkins is one of the only manageable contracts we still have. Why do we trade him?
3) KG, at this point in his life, CANNOT play the 5. If we draw Orlando or Cleveland somehow in the playoffs, without a solid Perkins in the lane (and considerable improvement otherwise), it's a death sentence.
4) Ray Allen's expiring contract is very valuable. I don't know if part of the problem is management dragging their feet or Danny waiting on the right deal, but if we're going to get a deal done, Ray Allen is our best chance. He's the 8th best paid player in the NBA right now, do you know how much back contract we could relieve teams of with that? We could take on Luol Deng AND Kirk Hinrich's outrageous contracts. We could take on David Lee, Wilson Chandler, Darko Milicic, AND Jared Jefferies. He is a huge chip that we're simply not using yet, because the right offer isn't there.