Rubber is everywhere. Narrow your focus to just your car -- it's everywhere in there, too. In addition to being the primary material in your tires, it is also found all over the place as dampeners, shock absorbers, and seals, among other things. The problem with rubber is that will break down and tear in due time. A torn rubber seal will require repairing. Running over a nail means a flat tire. These issues may be nearly non-existent in the future.