You have to remember, though, that as time goes on and technology advances the average tank may not become a thing of the past but it will have to step aside for the next big thing. Even now the older model tanks may be about to make way for things like http://www.popsci.com/invention. An unmanned tank that can drive over nearly any obstacle. And once the technology used to create things such as the 'Iron-Man' suit becomes a more exact science it will become cheaper and faster to make and in the future could become a very real part of our military arenal.