To figure out what this really means conceder the source.Remember Enron? Just before it collapsed, stock analysts were rating it as a strong buy, a must own stock.Moody is no different than the stock analysts. Just before the financial collapse they had a AAA rating on the credit default swaps.
So if Moody says it might have to downgrade US treasuries in a year, it really means that treasuries are actually downgraded now. This means higher interest rates, higher taxes and higher unemployment are almost a certainty.