I still think think the breakup should have been Seth playing the Jeff Hardy face and Dean being the heel. You have Dean as HHH's loose cannon enforcer, and eventually when the time is right, you turn him face by having him stand up to HHH.
Seth go for the Jeff Hardy flippy teen girl thing for awhile, then he can turn later.
I think they could have kept Reigns with either Seth or Dean as the silent killer, then whenever you turn one of them, you have your natural branch for him. They launched the Reigns thing before it was ready, I think he needed another year of just being that guy who would whip someone and not be a real face or heel for awhile till you are ready to pull the trigger.
Then, way in the distance...3-4 years down the road, you can lay out a scenario for the old forces to reunite to as The Shield to save us all from some awful champ or something......maybe if Cena pulls the trigger on a heel nWo style crew and it looks like he has the title and everything on lock with some lackeys and then, outta nowhere, here comes the shield.