The main battle tank is not likely to disappear into the history books as the horse cavalry units of old did during the early part of the 20th century, but technological advancements might fundamentally change the nature of future armored vehicles. The U.S. Army is currently conducting an analysis of alternatives on what a future family of armored vehicles might look like.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.