I appreciate your concerns. I'll tell you what I think will happen.
Unlike Ms. May, I don't think it's the first past the post system that generated the Bloc Québécois. I think what will happen with a proportional system is that you'll get a “B.C. First” party, and people in British Columbia will appreciate, given the number of seats they have, that they're not going to become the official opposition but that in a minority Parliament they could be the difference between being part of keeping a coalition in power and not, and could end up driving the agenda of a federal government in favour of British Columbia. Then we'll get an “Alberta First” party.
Actually, the position of the Bloc would probably be reinforced. I think that's the danger. We saw, in Israel, a pensioners' party arise, but on vital issues of war and peace they had no position whatsoever. They were simply interested in securing the position of pensioners.