#3 Already teasing the breakup
Let's be honest here.
WWE isn't going to hint at something in a storyline if it's not something they want to do or plan on doing at some point.
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With that being said, the ongoing teases of Dean Ambrose betraying The Shield seem to point to WWE pulling the trigger on the split sooner rather than later.
In fact, according to some rumors, the split is set to happen around The Survivor Series pay per view, which means these storyline teases are no mistake and are going to get worse as time goes on.
Furthermore, it looks like Ambrose will officially be the one to cause the split, meaning that Ambrose will most likely be the one to turn heel and betray the group.