In the context of what I think about preferential ballots, I would have said that a preferential ballot on a district magnitude of one—i.e., just changing the ballot structure—for me is a change that's not really worth doing. I would be more supportive of a preferential ballot if we moved to something like the single transferable vote, where you would need a district magnitude of at least three, preferably five.
The difficulty there is that Canada already has very large districts, both in terms of population and in terms of geography, depending on which one you're looking at. How do you draw those boundaries in a way that preserves local representation in a meaningful way? The difficulty there is that if you increase district magnitude like that, you also have to increase the number of seats to keep that strong local link, because we are so geographically dispersed.