Let me start by saying that I realize this idea of trading Suh is obviously controversial and by some people's standards - crazy. Before you castigate me, let me make my case. Jim Schwartz is a disciple of Bill Belichick. One of Belichick's "trademarks" is his willingness to cut loose highly paid (and highly productive) personnel - via trades. Usually, he gets draft picks in return. Over the years, Belichick has been able to stockpile a vast amount of extra draft picks which he uses judiciously to ensure that New England has been able to remain a powerhouse in the NFL for many, many years.
The business side of this strategy would seem to infer that Belichick realized years ago that there was simply no way to maintain the core nucleus consisting of too many highly prized (and highly paid) superstars. He was also smart enough to realize that you cant put too much money into too few positions thus leaving the rest of the team mediocre (or worse).
The Lions current situation is that they have 1/2 of their salary cap tied up in 4 players (Stafford, Johnson, Suh and Vanden Bosch). There is NO WAY that you break up the Stafford/Johnson connection. That leaves Suh and Vanden Bosch and Kyle isnt going to yield very much in return if he was put on the trading block - not to mention that he is a leader on this team without equal.
The Lions are extremely deep in talent on the D line and Suh's absence would more than be compensated for by the likes of Fairley, Williams, Hill and Fluellen. Would it cause a decrease in capability? Perhaps a bit - but, probably not as much as you would think. Another factor to consider is that Suh is NOT a team player; nor is he the type of guy in the locker room that "fits in". Did you know that Suh was the ONLY Lion player to NOT circle the stadium after the last home game and high five the fans? The Lions could garner a wealth of draft picks in exchange for Suh. Probably at least a couple of 1st rounds, perhaps a 2nd or a couple of 3rds as well. There would be no shortage of suitors if the Lions were to make it known that a deal for Suh could be had if the price was right. The other benefit of trading Suh? It would free up a substantial amount of cap space not only this year, but, for the next several years as well