As stated previously. Cena has stepped away from title feuds to focus on building new stars.
The belt isn't being contested for among Cena and Bray. Cena and Bray is a the modern equivalent of a blood feud. Cena deciding to even momentarily ignore the man who has been hounding him and haunting him for the past year to focus on the belt is stupid booking.
Having a feud for it between Evolution and Shield makes much more sense playing on the fact that Evolution did not want Bryan to hold the belt in the first place. And them stripping Bryan of the belt is the biggest injustice of all in that situation, which plays perfectly in the MO of the shield, which helps the feud between the two factions. Thus putting the belt on a member of Evolution or Shield makes sense, whilst putting it on Cena or Wyatt does not.
Disagree - Cena vs. Wyatt is about spreading Wyatt's message and influencing fans away from Cena. What better way for Bray to express it to the WWE universe than as champ?
I don't see how you can put the title into a 3 vs. 3 angle tbh and, in turn, how Reigns would win it from there.