I'm really unsure, when I first heard/saw them breaking up, I wasn't keen, the only reason being is because they are SO good, I wanted them to have longevity (like The Four Horsemen did) however at the same time, I really want to see them all have singles runs, specially Ambrose.
So I'm really undecided in regards to this to be honest, they seemed to have done everything they could have done, except rebel against the authority (which they're doing now), this kinda makes me wonder if they're doing this angle last to have them over with the crowd, more specifically Reigns if he goes for a face run, say if Ambrose (for example) does the heel thing, it's so easy for him to do anything against the other members of The Shield to get his heel turn, but for one of them to do a face turn, not so much, so build the whole unit up towards a possible face gimmick and then they're ready to split.
I'll have a think on this before I add my vote, as at the moment I am kinda unsure to be honest.