If you can start a QB in the flex and you don't really have any other needs I wouldn't trade him just for the sake of trading him. That said, his value is about as high as it's gonna get. Defenses are going to adjust to that option crap, and Vick's always a risk to get injured.
"I disapprove of what you say, but I will defend to the death your right to say it." -- Voltaire