I can't believe Flynn's stock is all that high at this point. He was a 7th round pick who signed a big contract and lost a preseason position battle to a rookie. Johnson, Schaub, and Kolb were all higher picks (4, 3, 2) and more highly regarded coming out of college. He's still basically unknown and his salary goes up the next two years of his contract. I'm sure Seattle doesn't want to pay him 6 and 8 million the next two years to be the backup. Unless they are able to convince teams that one game two years ago was worth it, I'd be surprised if Seattle is able to get a high pick for him at this point. If they ask for that you say no.
If Green Bay was trying to trade him after last year I might agree, but with his stock falling I don't think anyone will be willing to give up a high pick for him now.