Have you experienced a traffic spike before Panda / Penguin hit?
There's an interesting article at SEW by Glenn reporting an interesting trend:
Before hitting you with the filter, Google is sometimes artificially sending you more traffic to collect more data.
Have you ever seen anything like that?
Also, Glenn suggests the possibility of "avoiding the disaster" provided you noticed the spike and took some action. I have my own doubts about that. Can you really avoid the filter? I actually doubt that!
Everything will be ok in the end
If it's not ok, it's not the end