Yes converting to coins will save the government money, but not until after 10 years.
It would not take 10 years though. The Mint could easily make a billion dollar coins each year. They made 940,870,000, in 2007, so I bet they could do more, if demand requested it.
Plus for 2010, they printed 1,856,000,000, $1 notes and 95% of notes printed are to replace existing ones. So really they only need to print 92,800,000 $1 notes for increased demand. A very small # for the US Mint to handle each year.http://www.moneyfactory.gov/uscurre...figures.html
During Fiscal Year (FY) 2011, the Bureau of Engraving and Printing delivered approximately 5.8 billion notes at an average cost of 9.1 cents per note.
And I bet that 9.1 cents includes the cost of the $100 note, which is more expensive to make than the dollar note. I think I read somewhere that it is about 6 cents for the dollar note. I just couldn't find it.
And the dollar coin costs 18 cents to make.
Since the dollar coin costs triple what a dollar note costs, in about 3 years, there would be a profit.
It could easily happen next year. The US Mint already has the machines in place for it to happen. We just need the government to make the decision.
I've been collecting, since 1975.