(The following is actually the end of his story, so click the link if you plan to read the whole thing)
Bargnani is a relic of a different time in Raptor-land, a time when offensive prowess was valued above all else, a time when the team was defined by a different cast of characters and a different guiding philosophy. For fans, he is a nightly reminder of what this team is supposed to be moving away from. The club wants to be seen as a gritty, defence-first outfit that wins with heart and hustle, and Bargnani is simply the antithesis to that style. He no longer belongs. Like so many Raptors before him, he has teased fans with what he could be and has refused to live up to that standard.
Perhaps more than anything, that is the reason the Raptors have to trade Bargnani. They can no longer shrug their shoulders at players that don't work to max-out their talent. That can no longer be a defining characteristic of the club. They cited DeMar DeRozan's work ethic as a big reason why they felt obligated to extend his contract. They cited Jonas Valanciunas' heart and hustle as big factors in not only drafting him fifth but being willing to wait a year for his arrival. They love the intensity of guys like Kyle Lowry and Amir Johnson. Those guys represent what the club says it wants to be about, which by extension has to mean that Andrea Bargnani does not.
If this club is so eager to move into the next phase of their evolution, then they have to admit that those thirteen games didn't mean what they thought they did. They have to work to expunge from the roster the pieces that don't fit the personality that the team so desperately wants to adopt, and that that process has to start by - finally - moving Bargnani out of Toronto.