#2 The Shield breaks up once again

Roman Reigns, Seth Rollins and Dean Ambrose returned as one unit this year. While the buildup to this moment was brilliantly planned, the execution left a lot to be desired. Lack of quality factions on the main roster meant that they had to face the same group over and over again.
Injury to Dean Ambrose and Reigns falling sick before their comeback match was a huge deterrent to this reunion run. Many have already likened this run to the DX's reunion back in 2006, a complete merch-selling venture.
We have already seen Seth Rollins turning his back on his brothers before, could Reigns or Ambrose turn heel this time around? Both the Superstars have never been heels in their singles career and a change in the scheme of things will definitely be interesting.