Do we franchise tag Nicks in this off season?
To somewhat take a different approach:
Just because a contract hasn't been signed doesn't mean one isn't being worked on. I remember something about being able to sign players after the season, but before free agency without that being a cap violation. It's possible that terms have been agreed to and after the SB we get them signed immediately.
I believe Brees will stay even if not tagged, not so sure about Nicks or Colston but I would say it's 60/40 they stay. It's always possible someone will give one of them an absurd contract.