Let's see the future free from pennies, first.
Years ago I was at the Denver mint (where they make pennies) and I questioned the tour guide there about getting rid of pennies (as per Oz). For some reason this tour guide couldn't comprehend a world without pennies, and started bring up all sorts of straw men arguments about how consumers would be ripped off, and other things (which I can't quite recall now). It was weird.
But what is also weird is that the US has a $1 coin. But I think that I have only ever seen it in use in Chicago. Apparently USians don't like them. That and the $2 bill - which only seems be given out as change at Monticello in Charlottesville VA, because it was Jeffersons home and his face is on the $2 bill.