If Quebec is so critical, Andrew Scheer may have at least as good a chance as Bernier, being fluent in French and supportive of Supply Management.  Ditto for O'Toole.  

Bernier's platform is probably too extreme for centrist voters in suburban swing ridings that the CPC need to win 2019.  Anyone who values health care should be concerned.  There are much better alternatives (Raitt, O'Toole, Scheer) if you want to see modest tax cuts and balanced budget without rocking the boat.