Retail packaging is a pain to deal with, take for example salt. You usually buy it in small boxes, about 1-2lbs each, commercial bags are 40-50lbs. So you need to buy 20-30 boxes a week at your local store, open the boxes one by one and empty it all into your restaurant bin. It's really a convenience thing, it's much easier to handle, transport and store a single really big bag. You still buy retail for stuff that makes sense though, maybe you only need like 2lb of lemons a week to make a sauce, in that case you'd go retail.
This is how the economics of all resource extraction works, not just oil. As prices rise and fall the economic viability of extracting a particular resource pocket changes. It's all in equilibrium and prices typically don't move as much as oil has in the last three months because market forces and people generally don't want to shoot themselves in the foot. The long term economics of Russia and KSA crashing the price so they get a monopoly doesn't make sense, doing so minimizes their profit if done over the long term since capital costs per barrel are fixed. Resource investments are multi-decade, the overall effect of this is going to be a blip in the grand scheme of things rather than an end to the industry.
Depends where you are in Quebec though, downtown Montreal, TMR, West Island, gay village, plateau probably fine. East end, you're going to have some troubles there bisdy
Those pits fill up with water once they're decommissioned unless you're in a dry region. The rocks usually have fractures which allow surrounding ground water to leak into the pit, only reason they don't flood is because you lower the water table around the pit in the years before.