Of course, the best possible roster would be incredibly loaded.
I expect these teams to miss the playoffs: Arizona, Calgary, Colorado, Edmonton, Vancouver, Winnipeg (I believe San Jose and Anaheim will get in) + Buffalo, Carolina, Columbus, Florida, New Jersey, Ottawa, Philadelphia, Toronto (a lot can change here, but still majority of these teams won't make it)
Also, I would be quite surprised to see Eric Staal at the Worlds again, considering the last time he represented there, he got seriously injured and it then influenced his next NHL season). But, never say never. I didn't include him here though. Even more surprising would be getting a call from Jarome Iginla. On the other hand, Shane Doan has represented Canada well many times and MAYBE he could be the veteran needed here to add some experience. I would be happy for him because he's a great player and a great leader and it would be great to win another gold-medal at the end of his career, when seemingly there is no hope really for a Stanley Cup now with the Coyotes, which is a shame for him.
I am also curious that how many available players of the last year's golden team actually answer the call / and how many will be actually invited by HC, if available. I mean mostly players like Giroux, Hall, Eberle, or O'Reilly. See in my team below, if having the opportunity, I would rather leave O'Reilly and Hall home, and play Monahan, Little, and Hoffman instead.
Matt Duchene - Claude Giroux - Nathan MacKinnon
Ryan O'Reilly - Connor McDavid - Jordan Eberle
Taylor Hall - Ryan Nugent-Hopkins - Ryan Johansen
Matt Hoffman - Kyle Turris - Mark Stone
Bryan Little, Sean Monahan
Mark Giordano - T.J. Brodie
Morgan Rielly - Aaron Ekblad
Dan Hamhuis - Tyson Barrie
Tyler Myers
Roberto Luongo, James Reimer
Bolded are players that I am 95% sure are on the team and answer the call if available and invited
Other players:
F: Domi, Duclair, Doan, Bennett, Iginla, Burrows, Ladd, Scheifele, Ennis, S.Reinhart, J.Staal, E.Staal, Skinner, Hartnell, Jenner, Huberdeau, Zajac, Henrique, Cammalleri, Simmonds, Couturier, B.Schenn, Lupul, Kadri, D.Strome, Virtanen, Marner
D: Murray, D.Hamilton, Phaneuf, Nurse, Tanev, D.Savard, Severson, Methot, Wiercioch)
G: Smith, Bernier, Talbot, Mason