I see no particular issues with making this change. I would guess that it could make copper and nickel more available and less expensive for applications that require these metals and treasury recycled coins could net a profit! However, I have no strong basis to make that assertion. .... .... Although, I may start hoarding as many of the old coins as I can, just for the value of the metals used in making them. Especially if the orange one gets another term. The old coins metal value would increase making it more valuable then our currency in the likely orange-one’s induced greatest depression ever and the deflation that would accompany it.