Well, if the planet goes, we go, after all, we are part of the planet, we have only ever existed on this planet. Using all the oil won't be the end of the world, it will just be a massive problem, but with any luck we have foresight to overcome it.
How can you possibly say that? You have never experienced either, society has never been forced back 200 years at the click of the fingers and you have never conciously known that you have not existed. There is no logic behind that.
I'm not saying they/(we) shouldn't/won't give those things up, I'm saying for them all to disappear quickly would be incredibly difficult. Without a steady transition, it would be pandemonium. Just look what happens when there is a minor fuel crisis, everyone goes out and panic buys. They dont really need to, the flow is still enough to supply the bear minimum, but the entire UK is in gridlock. As the amount of oil drops, its going to be hard to accept the change unless it's very gradual and alternatives are ready. Technology in it's very anture is emant to advance, but if suddenly it dropped back 200 years, I don't you'd be quite as happy as you make out.