The number of people in urban areas increases and a clash between equal nations is improbable. So the war of the future would take place in urban areas against insurgents and the enemy of the modern tank would be IEDs and anti-tank weopons carried by a soldier. How should the ultimative tank look like to counter insurgents in a city. Large calibre guns with HE-ammunition, slow, heavy armoured many crenels, a personal carrier to clear the sector or all in all a rolling fortress, which is highly armoured and could carry troops. Is this possible or senseless ?