"Report: Replacing $1 Bills with $1 Coins Could Save America Billions"
I think this is based on a fallacious assumption. The assumption that people will still be using coins or paper money in 30 years. Secondly, plastic notes as used in Australia are certainly durable enough. Just because the USA uses poor quality paper money doesn't mean that paper money cannot last.
I have an excellent idea for the USA to save money - abolish all coins below a dime. Australia abolished 1c, 2c coins almost 20 years ago and the result has only been positive.