Does Fitz have trade value?

So, while I am quite impressed with what Fitz has done through the first three games, I still firmly believe that the future of this team lies in Winston's hands. Is there any trade value for Fitz given these first three games? Didn't the Pats absolutely fleece someone for Matt Cassell in similar situations? While it may sound absurd, we have a capable (well supposedly) backup in...whatever his name is (I'm slightly tipsy atm) so why not get value out of this. Another food-for-thought question is, given Fitz history of Fitzmagic vs Fitztragic, don't we risk his trade value (if he has any) the more we play him.