There is a window where a failing industrial state would see these stored vehicles as more than just scrap value.
In World War 2 Australia was in a parlous state before the US joined the war and every rusty gun available was being dragged into government workshops to see if it could be made serviceable in any way. It was so bad there was a proposal to bring in civilian trucks, convert them to armoured cars for the length of the emergency and then deactivate and return the trucks to the civilians after the war. In my mind at least all the big powers reach this state during the Twilight War.
Working ex-military vehicles, especially armoured vehicles, can be given a modern weapon and placed in an Ad Hoc Emergency Defence Force unit for the duration. M551s could be given a low pressure 105mm gun, as could a Sherman (it actually has better armour).
Are these weapons going to Europe? No. They will be used when the final decline is imminent and the administrations are trying to (alas unsuccessfully) stave off collapse. They might never operate more than 50km from their refurbishment site.
An M3 Half Track might be 50+ years old but given an new M2, slat armour and desperate troops it's still a force to be reckoned with.
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