Here in the western states we have $1 coins, but I don't see them much in circulation. Once in a while, I'll get one as change and you can use them in parking meters. But I've never had anyone complain when I used one. Oddly, people 100 years ago or so didn't like "paper" money and preferred coins. At least you could melt them down for the value of the metal. Paper just burns. If the treasury wants to promote use of coin dollars, they'll have to distribute more. People will get used to them.