#4 Baron Corbin

Attitude problems and a variety of incidents are what has stalled Baron Corbin's career and while some were rumoring that The Lone Wolf would have a career renaissance once drafted to Raw in The Superstar shakeup, a loss to No Way Jose early on and a lot of talk without much to show for it, seems to show that the rumor is untrue.
Not only that, Corbin also isn't very well liked by the WWE Universe, which pretty much kills the possibility of a face turn to give him a fresh character.
Breaking Vince Russo and Jim Cornette update HERE.
In the end, maybe WWE can use him as fodder to help make other babyfaces look good when they knock off the 6-foot lone wolf, but other then that, there isn't really much use for him beyond that.
WWE could even use him as Reigns' next opponent after he is done with Jinder Mahal, which while that will add some longevity to his time in the spotlight, it will probably end with him taking a huge loss to Roman Reigns when the time comes.
One wrong move ended Big E's career - Watch Here!