Before making any decisions on volume, make sure you know what you are looking at. In this case 75% of yesterday’s volume appears to be a coordinated trade/trades. They were done as blocks of 4 mil, .5 mil and then 4.5 mil.
Trades of that nature are in no way comparable to the spikes in volume you see everday when thousands of new investors are entering a thinner, speculative security. In fact, I would dismiss the value in that type of volume almost completely. First, because it was likely only one or two buyers and/or one or two sellers. Second, because the type of institution that would do that trade likely is not making any kind of speculative bet solely on the value of the dollar. Instead, it is probably representative of hedging activity in a portfolio worth billions of dollars.