LifeinAsia - 4:00 pm on Mar 27, 2009 (gmt 0)
I'll add to anallawalla's counter example. We have seen several short-term traffic drops after outages of just a few hours. (Traffic was back to normal after a few days.) It's a huge site and Google comes by all day long. So your actual mileage may vary on many factors, but it DOES seem possible, if not likely, to experience a traffic drop after an extended downtime.