i say give Bargnani
one more year. but use him a a completely different way depending on what team raps are playing. right now, the core of 3 pfs (davis, amir and bargnani) and hopefully get another true centre (doesnt' have to be the best centre alive, but good enough) and rotate them accordingly. try to play Bargnani
off the bench at times when playing teams that are good in scoring in the paint. maybe start him when facing a team with a lot of shooters.
if this doesn't work, time to let him go. it's not like the raps are goign to be competing for anyhting next year, so who cares.