I suspect it will be Sakic. He and Yzerman are always put together in the minds of fans, and with good reason. Sakic is a thoughtful hockey guy, is now immersing himself in the profession of NHL management (much like Yzerman prior to 2010) and is a legendary player for Canada that no one could complain about. Seems like the logical follow up to Yzerman.
Messier has too many shady instances when involved with personnel decisions to warrant consideration (I hope HC agrees). Roy turned down HC multiple times while still in his prime (even the World Cup and Olympics) so I highly doubt they will consider him. Chiarelli is fine as an assistant, but I did not like how he advocated for Kunitz (claiming he could make the team regardless of Crosby) and Lucic in the behind the scenes video by CBC.
Coaching staff is much more important. The average poster on this website could select a team Canada more than strong enough to win.