Any "Real (Market?) Economist"TM cannot admit of a true limitation to supply. It doesn't enter into economics. There are always subsitutes and the market is just what is needed to develop them.
Peak Oil is simply our failure to go out to Jupiter and fetch home the Oil Moon, Titan. That lil puppy will power our vehicles and generators for a thousand years.
The technology to fetch home entire moons exists today in the pages of Popular Science, Weird Stories, and Marvel Comics. It's simply a matter of sufficient market capital moving in that direction, followed by a brief period of correctly applied technology, and Voila! -- even China will be able to offer every citizen two cars in their garage, and a chicken and some pot. Or sumpin' laddat.
These highly educated economists, these Fellows of the Ivory Tower, shall henceforth be known as the Oil Moon school of economics, to distinguish them from persons possessing common sense. Frames exist within larger frames. Draw a larger frame around your opponent's frame; he will appear wrong or insufficient. This is how wizards play.