Coins are not made with valuable metals since 1964 for silver coins, and since 1933 for bigger value gold coins. That's in USA but all nations followed. Base cheap metals are used ever since, even the penny wasn't copper since 1983. This theory was just made up by this guy, he says it makes sense to him so it's true. There is zero chance in today's modern world that any kind of new system for money will be based on cheap metal coinage just because this one guy says so. He told me here on Hive (Steemit pre fork) in 2018 that Trump was going to save the nation & world by making cheap worthless coins the new system and revalue these cheap almost worthless coins because it's way to keep track of things and because treasury makes them. It has no evidence of any fact, he even used to say it would 100% happen in Trumps first term and called any of us asking for evidence fools. That's why I comment critiquing it, he can be ridiculous when people ask why he pushed this theory. When pressed he admits he made it up. He also said Trump was going to arrest all the bad criminals in government and pushed silly fake narratives like Q Anon in 2017/2018. It's made up nonsense.