Bargnani's gotta go. Two decent shooting games do not negate the previous 7 years.
Here's a trade I would love:
Utah: Bargnani, Derozan
Toronto: Milsap, Mo Williams
Utah might do this trade if they don't want to pay Milsap what he'll get in free agency. Still, Favors is their guy at PF, so I'm not sure how they would feel about a three man rotation with Bargnani coming off the bench. As for Derozan, Utah is desperate for scoring on the wing, though it would depend how they view Derozan's value post contract extension.
From Toronto's perspective, this trade would obviously by contingent on Milsap signing an extension (Mo could walk at the end of the season and I still love this deal). Even if we slightly overpay for Milsap, better to pay him 12-14M a season, than Bargnani and Derozan 20-22 combined.