In my world, goods and services I purchase are the final goods, not the money I need to purchase them. About "collecting en masse", I guess time will tell. You

In my world, goods and services I purchase are the final goods, not the money I need to purchase them. About "collecting en masse", I guess time will tell. You might be right, for those holding large amounts of dollars (China for example) a "run on the US government" would be a bad thing, they're better off unloading their less valuable currency gradually and exchanging them for something with intrinsic value such as gold and silver. And in the mean time, the dollar will keep on loosing it's value.