Calm down folks, the 2hr Go-home RAW show for last year's Summerslam, Aug 8th 2011, did only 3.09 rating which was a disappointment(although Viewership was higher with 4.54m average compared to this week's 4.30m for regular 2hrs). Adult 18-49 actually dropped 17.8% compared to previous year and teen males also went down 38.4%. And Punk retained/won the title last year by defeating Cena. Del rio cashed in and won, but that had nothing to do with ratings, Cena-Del Rio was original plan but Punk's shoot promo kinda changed everything from MITB.
Point is, One week's low rating is nothing to worry about. I still believe Punk is set to retain by pinning Big show at summerslam. He will most likely drop it to the Rock at rumble, Cena wins Rumble 2013 on the same night and there you have it, your Wrestlemania 29 main event.
Once in a lifetime 2.