Can you share any information about people taking the same job for less pay? I haven't seen evidence of this, but I don't doubt that it's happening in some places. I'll admit that I live in sort of a bubble because my salary has doubled since 2008 and the salaries of many of my friends and family have grown quite a bit as well. Granted, most of the people I know work in some sort of tech-related field.
I don't have any citations handy, but there are a lot of stories, both reported in the press and relayed anecdotally, of people who got laid off during the crash and then got re-hired at lower pay once the dust settled.
On top of that, a lot of people were unemployed for a long time and then had to jump on the first offer they got, which often paid less.