I'd guess Flynn doesn't get traded. It seems like Thompson doesn't like trading away players unless they're trying to move past them (Favre), they're unsigned and have great hype value to trade them (Corey Williams) or if they're not going to make the team so Thompson tries trading for someone who might.
So Thompson values the players we have very much and so someone who probably have to reach in a trade to get someone from him. So I'd say 2nd or high 3rd as far as value Thompson might have put on Flynn.
But I don't think Flynn has proven he'd be worth that. Yes they almost won the Patriots game with him as starter but they were using him as a game manager type QB and he had some problems managing the game.
He had to wait a lot longer than other QBs to get the call in, I didn't see him changing the calls from the pre-snap much... and he had trouble with time management in the 4th. Also he had trouble getting the ball close to any WRs 20+ yards down field. So I don't think anyone is gonna be looking at him as starter right now and therefor not willing to pay Thompson price. Of course that being said the Seahawks traded for Charlie Whitehurst who's has been questioned big time.