re: When will oil come back?

If you honestly think the food grown today isn't the best in the history of man I can't help you. As for drugs, feel free to go without and see how far you get.

There are reasons why average lifespan has increased so much in developed countries and modern medicine, sanitation, and a stable/safe food supply are your primary suspects.

Of course, I wouldn't presume to say that hydrocarbons don't play a crucial role in all of this. They alone, however, are not enough.