I am a bit of an ole fart, and have seen the economic cycle many times over the decades. This is not the worst I have seen so far, and not much different from low times of the past.
I cannot tell you when it will turn back up, but I can tell you what to look for. Housing has always lead the way into a recession, and always leads us out. When you see housing starts going up for a month or two straight, then you know things are looking up. My crystal ball says July 2009.
My biggest hope is it teaches each of us fiscal responsibility. And for some like my children, these are the best of times; both are out of college with med degrees and just starting their careers with good pay. They have the money for a down payment, housing prices falling, and there service is in hot demand. Daughter walked into a car dealership and named her terms and great deal, and she can afford it.