Well there are other options available to a government if they don't have representation in a region. They can put people in cabinet that are not members of Parliament but are acceptable within that region. There are mechanisms.
I'm not arguing for the status quo, however. My point concerns the communities, not making proportional representation discriminatory to rural communities. My other point relates to the legitimacy of the exercise. I think you have to go well beyond what's currently laid out. In the eyes of the public this is not a legitimate exercise for the government to go ahead with a change to a 150-year-old electoral system.