You don't trade Perk to get "younger", you trade him to get more talented (and cost controlled).
The idea of trading Perk is to try to get a player with the potential to be a star. Perk is what he is. He is a very good role player, but will likely never be any more than that. So if you can get a more well-rounded player who could be a star, then it makes sense.
Exactly, which is why he, along with Glen Davis, should have been traded last offseason when their respective values were never higher. Look, I like Big Baby and respect Perk for the hard work that he does, but you have to decide whether or not these guys are going to be future stars, or above-average role players/bench guys on a championship squad.
Last year, Detroit was interested in Big Baby, and you would have to think that Dumars would have liked to get his hands on Perk, for both his style of play and his inexpensive contract. I mean, potentially, we could have completed some kind of sign and trade with the Pistons to get Sheed for Perk and Tony if we could have(another expiring contract), and if it's possible (which I don't think it is) trade Big Baby for two of Detroit's second rounders last year (preferably the two highest of their three) and we could have selected Dejuan Blair, who easily could have replaced Leon and Baby, and Jonas Jerebko, in addition to Wes Matthews with our 58th pick. All that would have been left to do is sign Ben Wallace once the buyout was completed with Phoenix. We still would have had the MLE to use, as well as the bi-annual exception, which would have allowed us to resign Marbury (I really think that a full season w/training camp would have been great for both Starbury and our team), go out and get Joe Smith, Jerry Stackhouse, and Tim Thomas (another big guy who could have helped our spacing). Sighhhhh.