Tanks are certainly not the be-all and end-all of modern industrial warfare. From Scott Ritter at unz.com:
Tank warfare has evolved. The large force-on-force armored battles that were the hallmark of much of WWII, the Arab-Israeli conflicts, which served as the foundation of operational doctrine for both NATO and the Soviet Union (and which was implemented in full by the United States during Operation Desert Storm in 1991), has run its course.
Like most military technological innovations, the ability to make a modern main battle tank survivable has been outstripped by the fielding of defensive systems designed to overcome such defenses. If a modern military force attempted to launch a large-scale tank-dominated attack against a well-equipped peer-level opponent armed with modern anti-tank missiles, the result would be a decisive defeat for the attacking party marked by the smoking hulks of burned-out tanks.
Don’t get me wrong: tanks still have a vital role to play on the modern battlefield. Their status as a mobile bunker is invaluable in the kind of meat-grinder conflicts of attrition that have come to define the current stage of large-scale ground combat. Speed and armor still contribute to survivability, and the main gun of a tank remains one of the deadliest weapons on the modern battlefield.
But the modern tank performs best as part of a combined arms team, supported by infantry (mounted and unmounted) and copious amounts of supporting arms (artillery and close air support.) As part of such a team, especially one that is well-trained in the art of close combat, the tank remains an essential weapon of war. However, if operated in isolation, a tank is simply an expensive mobile coffin.