The deficit was never our biggest problem, that title goes to unemployment, and it's even less of a problem today:
Dwindling Deficit Disorder, by Paul Krugman, Commentary, NY Times: For three years and more, policy debate in Washington has been dominated by warnings about the dangers of budget deficits. A few lonely economists have tried from the beginning to point out that this fixation is all wrong, that deficit spending is actually appropriate in a depressed economy. But even though the deficit scolds have been wrong about everything so far — where are the soaring interest rates we were promised? — protests that we are having the wrong conversation have consistently fallen on deaf ears.
What’s really remarkable at this point, however, is the persistence of the deficit fixation in the face of rapidly changing facts. People still talk as if the deficit were exploding...; in fact, the deficit is falling more rapidly than it has for generations, it is already down to sustainable levels, and it is too small given the state of the economy. ...
There are, of course, longer-term fiscal issues: rising health costs and an aging population will put the budget under growing pressure over the course of the 2020s. But I have yet to see any coherent explanation of why these longer-run concerns should determine budget policy right now. And as I said, given the needs of the economy, the deficit is currently too small. ...
Yes, we’ll want to reduce deficits once the economy recovers... But unemployment, especially long-term unemployment, is still unacceptably high. “The boom, not the slump, is the time for austerity,” John Maynard Keynes declared many years ago. He was right — all you have to do is look at Europe to see the disastrous effects of austerity on weak economies. And this is still nothing like a boom.
Now, I’m aware that the facts about our dwindling deficit are unwelcome in many quarters. Fiscal fearmongering is a major industry inside the Beltway, especially among those looking for excuses to do what they really want, namely dismantle Medicare, Medicaid and Social Security. People whose careers are heavily invested in the deficit-scold industry don’t want to let evidence undermine their scare tactics; as the deficit dwindles, we’re sure to encounter a blizzard of bogus numbers purporting to show that we’re still in some kind of fiscal crisis.
But we aren’t. The deficit is indeed dwindling, and the case for making the deficit a central policy concern, which was never very strong given low borrowing costs and high unemployment, has now completely vanished.