In the face of the manufactured crisis that is the austerity bomb, it looks like at least a few people are hoping to convince Congress to switch our $1 cash form from a bill to a coin. I am wholly in support, of course (I also think we should add a $2 coin to the mix, the combination would mean this article is crap, as seigniorage would be much greater, and usage of the $2 would be likely higher than the $1).
Really, though, if someone wants to argue for making/saving money with the mint the most obvious solution is to stop minting the penny, and even more so, the nickel. Both of those cost more to make than the face value. If we stopped making them we would save money.
There are weak, but understandable arguments for keeping the $1 bill--I disagree with them but they exist--the arguments against killing the penny on the other hand (or the nickel, but you hear more about ending the penny) are some combination of paranoid, and/or stupid (I was going to add selfish, but those are pretty much also stupid).