Autopilot would be useful in Toronto at least 90% off the time in the winter. In Toronto the roads are typically cleared of snow within a day or two of snowfall. But on some streets you can expect snowpacked roads for a long time - and I thought that was even more frequent where there is no melting until spring.No discussion about that, sorry. As others point out, not much Tesla can do about those types of issues in the near future. I was keeping an eye on our main freeways through town last winter... they typically were clear (what I would expect would be needed for autopilot) within a couple days of most snow falls, and we don't get snow every day. Granted, it may be different in Toronto. I think I would be satisfied getting to use Autopilot 50%-75% in the winter, and would understand that the remainder of it, perhaps it is better that a person is in control - even just for ice and stupid drivers in the conditions.
I am thinking ahead to where there are more and more cars on autopilot which is supposed to lead to reduced congestion. Think of the chaos that snow will cause on those days when you can't use autopilot and everyone is used to always using autopilot - we will become like those places where the city shuts down when 0.25" of snow falls.