Well, the Fed IS a private entity, unfortunately, it is owned & controlled by evil banksters.
I hope for coins like, an embossed foil of gold embedded into an epoxy puck, as a recognizable coin.
And, already copper pennies and nickel filled nickels are already way about melt value. So, horde them.
http://coinapps.com/base-metal/coin/calculator/
Until folks are ready to accept that money is unnecessary, some form of coinage will persist.
Although we could do it an any given tuesday, the crowd just isn't ready for that.
They are ready to reevaluate the value of money.
To replace all the coinage in america would be a logistics nightmare, easier to just reassign the the old coins to the new value, imo.