I think in some systems it wouldn't change all that much. Preferential balloting wouldn't change that dynamic; a mixed member proportional system wouldn't necessarily change that dynamic. You would still have ridings across the country; there would just be a set of seats set aside on the basis of party lists.
I think my concern would be that we want to avoid multi-member ridings in Canada. I think it's just the nature of our geography and that rural-urban divide being so pronounced. On a technical side, it would be really difficult to draw up fair constituencies. It's difficult enough in the system we have.
My concern with multi-member constituencies really relates to more confusion about who one's local representative is. On the practical side, who is doing the constituency work and who is not, and how is that sorted out? Could that end up with voters not being represented in a fair way or maybe not represented in the same way across different parts of a province?
My one personal issue would be the multi-member ridings. That would really be an issue under single transferable vote.