Suppose the future without oil arrives very quickly. Suppose a bad fairy waves his wand, and poof! Suddenly there’s no oil, anywhere, at all.
Everything would immediately come to a halt. No cars, no planes; a few trains still running on hydroelectric, and some bicycles, but that wouldn’t take very many people very far. Food would cease to flow into the cities, water would cease to flow out of the taps. Within hours, panic would set in.
The first result would be the disappearance of the word “we”: except in areas with exceptional organization and leadership, the word “I” would replace it, as the war of all against all sets in. There would be a run on the supermarkets, followed immediately by food riots and looting. There would also be a run on the banks — people would want their money out for black market purchasing, although all currencies would quickly lose value, replaced by bartering. In any case the banks would close: their electronic systems would shut down, and they’d run out of cash.
Having looted and hoarded some food and filled their bathtubs with water, people would hunker down in their houses, creeping out into the backyards if they dared because their toilets would no longer flush. The lights would go out. Communication systems would break down. What next? Open a can of dog food, eat it, then eat the dog, then wait for the authorities to restore order. But the authorities — lacking transport — would be unable to do this.