16 starting quarterbacks threw for under 200 yards in week 1. In 2009, there were 9 week 1 starting QBs under 200 passing yards. Aaron Rodgers, Matt Schaub, Brett Favre, Donovan McNabb, and David Garrard started off both seasons with a sub 200 yard passing performance.
Even elite QBs don't always start off on fire. Don't panic after one week. Last year Rodgers, Schaub, and Favre turned out just fine.