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but realise that the oil crisis isn't just about energy to our cars and down wires into our homes.

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Actually, it is. Almost all oil is used for transportation and as a fuel in manufacturing, agriculture, and mining. 4% of total oil usage is for plastics. 1% is for fertilizer and pesticide production. We have enough to produce ample of these for hundreds of years. And oil production is not going to stop in 50 years, it will simply be so slowed down that it can't provide for today's fuel needs. There will still be plenty for the production of plastics and fertilizers for a long time to come.

Plastic from Wikipedia. Check out Price and the Future for discussions of very likely plastic alternatives

Also, Alternatives to oil from wikipedia makes for some interesting reading.

Also read about the Fast breeder reactor. With current technology, we can supply all of our energy needs for the next 10,000 years (at least), cheaply, in complete safely and with very little pollution.

I agree there may be a crisis of sorts, the price of many goods will go up, and the economy may well slip into a bad recession for a period of time. But we're definitely not going back to the stone ages, or even the 1950s.