Tanks have a lot of benefits, and we'll use them if the situation arises that needs them.     If the US were to ever be invaded, tanks would play a big role in defense.     When an economy suffers or nears collapse from an invasion, tanks are going to be essential. Drones may be easier to replace, but if you loose the capability to produce more of either, the tank is going to have the staying power.     Some ways we waged war can never be given up because as we know, drones can be hijacked or rendered useless rather easily with scrambling tech. Right now we can get away with it, but not for long. This is why a physical person is much better to have behind the controls of a vehicle.     The problem is, we don't want to need tanks and not have them. You don't want to start production on tanks once a war starts.     Do we need less tanks? Probably. Do we need no tanks? No.