[Urbane Guerrilla]

There are no limitless supplies, true -- but that is the one thing above all else that drives innovation.

Five billion years from today, the sun won't be exactly gone, but it will be a frightfully inconvenient red giant star, and the Earth, toast. Toast containing about a quarter of the U238 it began with and a lot more lead.

Flint, more and more efficiently exploited, then replaced in tools by bronze.

Bronze, strategically limited by availability of tin, replaced by the more plentiful but harder to extract iron.

Whale oil for lighting, replaced wholly by kerosene.

Pay phones will be almost entirely replaced by portable cell phones.

You can come up with two dozen more off the top of your head.