I think it's a fair question.
I must confess that I'm with Henry on this. I think greater proportionality is so much better that it would be more than sad if we didn't move in that direction.
That's not to say that you're incorrect that any choice involves trade-offs. It depends a bit on how you design the system. One of the challenges that we will have to deal with is the size of ridings, for example, or the size of districts, especially with respect to dispersed population areas. I think we're going to have to be creative in the design of this to accommodate the diversity of the country, including urban and rural differences.
For what it's worth, I know that Jean-Pierre Kingsley has speculated about some possibilities. I also know that Fair Vote Canada is working on models that ensure greater proportionality but respect the differences between urban and rural areas.