This is nothing new. In 1993, the GAO issued, "One-Dollar Coin: Reintroduction Could Save Millions if Properly Managed" (GGD-93-56). In 1995, the agency issued, "A Dollar Coin Could Save Millions (T-GGD-95-203) as well as "1-Dollar Coin: Reintroduction Could Save Millions If It Replaced the 1-Dollar Note" (T-GGD-95-146).
Does the United States want to retire its iconic $1 note, which has featured George Washington in one form or another for nearly a century?
Other GAO reports hint at the answer, such as, "A New Dollar Coin Has Budgetary Savings Potential But Questionable Acceptability" (T-GGD-90-50, 1990); "National Coinage Proposals: Limited Public Demand for New Dollar Coin or Elimination of Pennies" (GGD-90-88, also 1990); and "New Dollar Coin: Marketing Campaign Raised Public Awareness but Not Widespread Use" (GAO-02-896, 2002).