The idea of trading a TE away seems pretty remote to me, depending on who it is... We've got lots of chaff, and some others who are very promising players. Might be able to trade one, possibly two of them, but I doubt that. Teams will scrounge the wire. It is just the big contending teams at the bottom of the FA pecking order who may show a real interest.
On that note, I see all that ballyhoo about Visanthe Shiancoe signing this offseason with the Ravens meant nothing. He just got cut, from a TE needy team, beat out by the aging Dallas Clark.