I predict the most extreme ones (Kellie Leitch or Brad Trost) won't win but nor will the most moderate (Michael Chong), instead it will be someone clearly on the right, but not extreme right.  Most likely it will be either Bernier, O'Toole, or Scheer.  Of those two Bernier is the least electable, Scheer not much better but at least unknown to most so if he does a remake anything is possible, while O'Toole is probably the most electable although will still face an uphill battle against Trudeau, but could at least reduce him to a minority.