The bet wouldn't be on each team though, it would be one of the team vs the field, since they are all fighting for 1 WC spot. Individually the Nucks might be the favorite, but the field is the overwhelming favorite to take that last WC spot. In that sense, Van is still a long shot to make the playoff. Therefore, the optimal strategy should be to move off the pending UFAs (and JTM if possible), take the assets and cap space and try to find replacements at the draft/summer. I really doubt they would do that due to other reasons (pissing off Hughes, upsetting the fan base, etc), but in terms of team building I think that is the best course of action.
And the whole league knows the Nucks are desperate for a D, and there aren't many available to begin with, therefore any trade we make (whether a long term piece or rental) we are going to pay through the nose for it. Is that really the best way forward for the organization, to overpay and buy at the position of weakness, just to try and save this season? Even if we sneak into the playoff, we stand no chances against the top seed teams, is that really worth the assets we trade for the upgrade?