In the future, metals capable of repairing themselves just might be commonplace.
Gold is more than a metal. It's a symbol, the physical incarnation of value and wealth and luxury, and this has been the case for thousands of years. This is partly because gold can be readily found and is easy to work, but also because of the appeal of the color and shine. So what's going to happen now that gold can be made into any color? Anarchy, that's what.