I could see Yzerman trading Namestnikov and promoting Berggren, but I also could see Namestnikov as someone that he might want to keep around oddly enough. I am fine either way. I would offer all the expiring defensemen for anything another team would be willing to give up: Leddy, DeKeyser, Stecher, or Staal. Not that you could get much. Greiss could be intriguing to someone if a team needs a goalie/backup for the stretch run randomly. I don't think the Wings end up doing much unless it is a surprise like Mantha for Vrana (so I guess Bert or Zadina heading out?).
The Athletic has Leddy as the 14th best trade chip available, Namestnikov 16th. Lists them both as High probability of being traded.