Voting about tanks indeed has little significance save that it makes you think about the situation. Wars are typically fought with the last wars technology and thinking. The resources France spent upon the Maginot Line and the concentration on infantry support tanks, (French armor technology was equal to Soviet tech IMO), didn't result in the defense of France or increase the time it took to overthrow the government at all. The costs quoted for modern armor are low. They should be increased 3 to 5 times over what was cited. The cited costs are more in line with Helicopter costs and helicopters can be neutralized just as easily as tanks for the same or similar costs. The role of technology in military operations is to project force further and faster. In this regard tanks and helicopters and aircraft carriers and drones all have a role. When it comes to securing and holding the gains these technologies have made the ultimate answer is flesh and blood.