The Obama administration talked about this and went with Platinum as it didnt have restrictions from congress like gold and silver does. Is it an idea, Yes. Will it work... Nope as then our current money will decrease as inflation increases. Zimbabwe did the same thing and ran their currency into the ground. Imagine if they printed and released 27 Trillion extra dollars into circulation. Imagine how many bills you would need to buy bread or eggs. What used to cost you a single dollar now cost you a stack of them.
I work at a bank and I had a customer seriously try to deposit a few of these novelty Trillion dollar coins that you can get from ebay for $5 from shipping. He started arguing that the US Mint made a trillion dollar coin and that he not only has one of them but THREE
and that on the back side it said that it was 9999 Platinum.
I had to explain how the US never had any currency that high and that its probably fake. Eventually he brought it in and wanted to deposit it, that is when I took my name badge and used the magnet to pick up the coins. Basically it was not platinum. He also brought some gemstones, a huge foreign currency collection in holders, and fake looking gold bars to deposit.
I had to explain the bank doesn't take these as payments but told him where he could take them to get cash. I asked him where he got those Trillion dollar coins at, and he said he bought them for $50 in the hood... After he left I quickly called those few business close by to let them know that a potentially stolen gold/currency/gems collection may be coming towards them.
This thread reminded me of this...