#3 Harper allies himself with Rowan and Daniel Bryan
Lest you forget, someone as talented as Luke Harper is sitting on the sidelines and hasn't been on TV for a really long time now, which seems like a problem. I'd even go so far as to say that Harper was the more talented of the Bludgeon Brothers, in my personal opinion.
From what I know, people love Luke Harper backstage and one can imagine Daniel Bryan lobbying to make him a part of the mix in the ongoing storyline. Could he be a third member of their stable, battling against Roman Reigns?
Reigns could potentially align himself with The Usos then, leading to a multitude of possibilities, opportunities, and dream feuds on both WWE brands. With Randy Orton's faction, The New Day, The OC, this trio and the one I've proposed with Roman Reigns, 6-man tag team matches could become cool again.
Now if only someone can convince Dean Ambrose to return to WWE and in time, align himself with Seth Rollins and Roman Reigns again.