They should do away with $1 bills as well, making users go to $1 coins. The cost of $1 bills is huge compared to their lifespan vs. coins. The public wouldn't like it.
A long time ago when I was a truck driver, periodically I would find myself at a K-mart distribution center. While there, I would often hit the employee breakroom and marvel at the vast array of vending machines and what one could purchase. Everything from coffee to ice cream.
On one particular occasion I had no coinage with which to feed the vending machines. I pulled out my wallet (no chain attached) only to find $20's. To my surprise the bill change machine accepted 20 dollar bills. I from Minnesota, so technology of this sort peaked my curiosity. I eagerly fed a $20 into the slot. It immediately gobbled up the bill. Once it digested the $20, the change machine did a rendition of Billy Joel's
Easy Money . Coins came crashing down! I thought I hit a slot machine jackpot, although I have never heard the sound of a slot machine jackpot. I dug out all these coins, huge coins! Bigger than a quarter, but smaller than a real silver dollar. Turns out these coins were Susan B. Anthony silver dollars and I only received 20, which was exactly equivalent to the amount I inserted into the machine, $20. No jackpot. But I did attend Susan B. Anthony Junior High in Minneapolis, so that was kinda cool.
I still have a few of the coins stashed in my socks and underwear drawer along with some real silver dollars, silver certificates and other weird money. The rest of the Susan B. Antony coins were given to my kids as a gift from the Tooth Fairy, or for getting beaned with a baseball. Hey, the coins were pretty much useless except at a bank or the K-mart breakroom and my kids thought they were somewhat impressive. One of those win-win situations.