I recently joined a facebook group to promote extending the metro to the West Island. I would love to see that, and have thought similar things in the past. Of course, I'm far from the only one. If you check out the wikipedia entry for the Montreal Metro you'll see that there have been many planned extensions over the years. That site only lists a small fraction of them, but even the original proposal from 1976 was better than what we have now:





If you check out the Metro de Montreal site, you'll find a number of other proposals. Naturally the one I like the most is the one they propose for 2100, although I think its what we should have now. As they point out on that site, we may have the second-largest metro in North America, but by European standards our transit network is puny. Madrid added over 60km of lines last year, which is roughly the size of our whole network. Oh, BTW the bandwidth for that site is limited and the first few times I tried to go there I got a "bandwidth exceeded, try again later", which is why the image below, although taken from that site, is hosted locally.