#2 Should not happen at SummerSlam - A singles match between Seth Rollins & Dominik Mysterio
Coming to the point of why WWE should not book a singles match between Seth Rollins and Dominik at SummerSlam, I'd like to quote Daniel Bryan - "WWE fans are fickle!"
Seth Rollins might be a massive heel on-screen, but the WWE Universe loves him as a wrestler and consider him to be one of the best in the world. Even after he extracted Rey Mysterio's eye at Extreme Rules, which is something only a massive heel can do, fans praised the entire match and his chemistry with Mysterio.
A former WWE writer just went after JBL for his comments HERE
There is already a portion of fans who are not happy with Dominik getting so much screen time ahead of several other WWE Superstars who have been working hard but hardly getting any TV time. Having Dominik face and go over Seth Rollins at SummerSlam in a singles match might turn fans against him.
Another issue is, that a singles match leaves out talents like Murphy, who deserve every chance to shine on a big stage.