I believe that John Morrison/Johnny Nitro will be returning to the WWE soon and here are a few reasons why I think that.
This reason is short but because Former WWE superstars always come back at the royal rumble.
Just (recently) finished a movie:
When superstars are doing movies they are usually not in the WWE and they focus on making movies. And usually once the movie is finished and been released they usually come back to WWE such as John Cena and Batista. Batista is making a movie now thats why he is not in the WWE at the moment.
Joey Mercury is back:
If you are not up to date with the WWE at the moment Joey Mercury is Seth Rollin's bodyguard along with Jamie Noble. Seth Rollins can never win a fight so he gets his bodyguards to attack his opponent so he can "show whose boss". So anyway hopefully John comes back and Knocks some sense in to him.
Teams always have arguments:
All good Tag-Teams have had at least 1 argument in the WWE and I don't think that those two have had an argument. Like I said all Tag-Teams have had fights such as Triple H and Shawn Michaels as Degeneration X and Jeff and Matt Hardy have had a few arguments. Triple H and Shawn's fight went for almost a year back in the early 2000's. and then as usual they always get back together. A little off track but I'm hoping John comes back to knock some sense into him. and then they have an argument.
He was mentioned a few weeks back:
If you are up to date with the WWE you will know but if not. Lately there has been old superstars coming back as a guest star, a few weeks ago Edge and Christian were the guest stars and they were talking about there history and said they had great rivalries such as The Hardy's, Dudley's and MNM. Obviously by rights that means any of them could come back, but The Hardy's and Dudley's are currently in TNA so they cant come back to WWE at the moment. And even Edge said that Mercury needs the sense knocked into him.
Last but not Least:
because he is just awesome!!!!!!!!!