I have a hard time imagining Sheahan really has much trade value at this point (a soft inconsistent FO guy with no [current] offensive ability?), but I don't think there's any real point in protecting Glendening, other than that you have to protect someone.
I do, too, but there was a lot of smoke around the TDL that Holland was getting offers for him. Frankly, even if he doesn't have trade value now, his contract isn't as bad some others and he has the potential to either make us want to keep him or to rebuild his trade value a bit.