I've read that Turkoglu is working hard in practice, putting in extra time, etc. I'd guess that his problems isn't poor attitude, but simply a lack of skill. Obviously he's still an NBA-caliber player, but he's not at the level that any decent team would think of as being in their top three.
His contract is pretty hefty to boot. I think he has 4 years left on that 53 million dollar contract right? When you put up that kind of cake.....Hedo being on OK player is what people are having a hard time with. He needs to play like a #3 here or people or going to skewer him.