WWE has changed direction with their original plans to break up The Shield.
Word got out before WrestleMania that the company was strongly considering breaking up the popular faction and on-air storylines teased dissension amongst the members. Around the time of WrestleMania XXX, it was reported that the breakup was delayed due to the strong responses they continued to get from WWE crowds.
Another factor believed to be at play is the grooming of Roman Reigns. He is still seen as a breakout star and a future main event player, but is not ready to go solo yet and will benefit from more time with Ambrose and Rollins.
The original plans would have had The Shield already broken up at this point.
(Credit: Wrestling Observer Newsletter)