I think this current hub-bub of riding representation is a reflection of another argument floating in the senate threads; Cdns are just some homogeneous culture that doesn't need regional representation anymore.
IMO that is bunk. Of the few things that McKay represents, maintaining the (1) riding / (1) vote, is something I support.
The belief we are some general culture is another of those Cdn superiority myths put out there to feel superior to our fractious neighbours.
We are a collection of regional views/values that can co-exist for the greater good of the collective, but to say we are blended is a farce. In any given decade you can find the regions resenting, feeling superior to, or just generally disliking another region.
The senate (and party elections) are a needed check to ensure we don't fracture; otherwise you'd have (4) or (5) Quebec's to deal with.