Can't really blame him after last year, his production dropped a ton. With Boozer actually being healthy his minutes dropped a fair amount, and he became the 4th option on offense.
I'm not sure where he expects to go where it'll be a whole lot better though. The rumor is Phoenix for Shawn Marion (though I have no idea why Phoenix would do that). He'd still be behind Amare, Nash, Barbosa, and possibly Bell and Diaw in the pecking order.
The team isn't going to have a whole lot of options after he averaged 8.5 points and 4.7 rebounds last year while making a whopping $14 mil last year.