#3 John Cena turns heel and retires the Big Red Machine
A more idealistic approach to make this feud intense would be to turn Cena heel and do anything it takes to bring The Undertaker back. The quest to have one match with The Undertaker could shift Cena's mindset and force him to pull off a shocker.
A possible confrontation with the 'Big Red Machine' integrated with a vicious brawl could give some edge to The Franchise's layered character. His utilization as a babyface for almost a decade has been exhausting for the WWE Universe, and a shocking turn could rejuvenate the 'Doctor of Thuganomics'.
His abilities to play a man possessed with a mission could bring him to the dark and possibly annihilate Kane in a huge brawl. Kane's days as a professional wrestler have become numbered now, and if there's any superstar who should send him out swinging, it should be The Franchise Player.
The viciousness displayed by 'Big Match' John could act as a warning to 'The Phenom' and give the fans what they have been anticipating for so long.