In terms of parachuting in candidates, I would say that if Canadians are against parachuting in a candidate at this point, all they have to do is vote against the candidate who was parachuted in.
The double vote makes it possible to indicate that a certain candidate was parachuted in, that the voter liked the candidate's party, but not the fact that the candidate was parachuted in the voter's riding. So the voter can vote for the party through the voters list, while for the local candidate, the voter could vote for a candidate closer to the region who has a better knowledge of the region's needs.