Here's what's really gonna happen bro:
After dominating 2013, taking on all-comers and defending his belt until the end of the year (I'll get to that later), after losing the title John decides that the only thing left to accomplish is challenge the streak at WM XXX. They have a few confrontations in the build up where Cena actually gets the better of The Deadman. It appears that Undertaker has met his match and Cena dominates most of the match itself, appearing that he's going to do the impossible again but a bruised and battered Undertaker just about manages to get the win. After the match it appears Cena will do the honourable thing and shake The Phenom's hand, but Cena explodes in a fit of rage and assaults him with a steel-chair, seemingly ending The Undertaker's career. After this he changes completely, after alligning himself with Paul Heyman he gets himself a new faction. Him and his new buddys run rough-shot all year long. He decides that Paul Heyman is no longer needed after HHH & Vince McMahon decide to support him and help him win his title back at Summerslam in 2014. Paul retaliates and brings back Brock Lesnar, who takes on Cena in a block-buster match at Survivor Series. Cena retains though and going into 2015 Undertaker returns and takes on John Cena, but Cena once again manages to come out on top. It seems nobody can stop John Cena, that is until the WWE Universes's new hero wins the RR and defeats John Cena at WM 31 (Once again, i'll tell you who that is later).
CM Punk re-appears at Payback 2013 and wins his returning match. It seems that he's back and better than ever. He's hungry to win back his WWE title but in July we see another re-appearance from Brock Lesnar (Who hasn't been seen since destroying HHH at Extreme Rules). Punk doesn't like that he's come back as he feels Paul Heyman should be devoting his efforts to getting Punk his title back. CM Punk interrupts one of Brock & Paul's speaches where he shockingly disrespects Brock Lesnar. This infuriates Lesnar who attacks CM Punk, much to Paul Heyman's dismay. Heyman intends on setting things straight between the two and calls for a truce, but Punk won't let things go and attacks Brock, which leads to Brock/Punk at Summerslam with Paul Heyman as the referee. Paul Heyman has to pick a side, and ends up screwing CM Punk out of a victory. Paul Heyman comes out the next time and begs CM Punk for forgiveness, but Punk's not having it and ends up dropping Paul Heyman with a GTS. With Brock Lesnar disappearing again Paul Heyman sets out to take down CM Punk, acquiring the services of various monsters, but none of them are able to take down CM Punk, who goes on to win the 2014 RR. At WM he takes on Paul Heyman's new golden bot (I'll tell you who it is in a second) and comes out victorious, finally winning back the WWE title. CM Punk is on top of the world after WM but runs into trouble with John Cena and his faction, who have set about taking CM Punk's title. After a long feud Cena comes away with the title, but not without the help of Triple H & Vince McMahon. After this he begins a direct feud with the evil boss HHH, who sets about making Punk's life a living hell. Punk over-comes him though and aims to get some gold back at WM 31, but this time he wants the WHC and challenges Antonio Cesaro. HHH being the devious bastard agrees to give Punk a shot at the title under one condition: He puts his career on the line. Punk agrees but loses to Cesaro, retiring at WM 31 in an emotional moment.
As explained earlier Brock feuds with Punk at Summerslam 2013. After that he leaves again but comes back and returns at the start of 2014, on the same night as The Rock. Brock is furious that The Rock has stolen his thunder and attacks The Great One. Rock wants a match with Brock at WM 30, but Heyman says that Rock has to put his career on the line. Rock says he'll do it if Lesnar does it, which Lesnar accepts. A career vs. career match is set for WM XXX, and Lesnar comes out on top. The Great One retires from wrestling for good. Lesnar AGAIN disappears until Paul Heyman convinces him to come back and battle the dominant John Cena, making him a temporary tweener. He can't get it done though and then he decides his turn to take on the streak, but he becomes the unfortunate 23rd victim. Brock steps away from the business but with no major fan-fair, we don't hear anything from him until he's inducted in to the 2020 HOF.
After The Shield take the tag team titles they each aim on taking John Cena's WWE Title in a Fatal-4-Way. This is where Ambrose's selfish side comes out and it costs The Shield big, allowing Cena to retain his title. We see this selfish side come out even more at MITB, but this time Ambrose gets the job done and wins MITB for the WWE title. With the other two defending their tag titles Ambrose gets involved in some singles feuds aiming to make a name for himself by taking down established names like Kane & Chris Jericho. Later on Paul Heyman convinces Ambrose to ditch The Shield altogether, which he does. After alligning himself with Heyman he cashes in MITB on John Cena at Survivor Series, completing his year long rise to stardom. During his feud with Cena we see just how sadistic Ambrose can be, and after defending his title against Cena he is challenged by CM Punk. Punk comes out on top in a classic feud that lasts for months. After this Ambrose has earned the respect of everybody and is constantly cheered in arena's through-out the country, which leaves the WWE with no option but to reluctantly turn him face. He keeps the same gimmick pretty much but just feuds with heels instead, and his popularity continues to grow. The WWE take advantage of his massive popularity and he is slowly pushed further & further through-out the year as a face, and then the 2015 RR comes and Ambrose wins. With the dominant champion Cena practically running the company Ambrose shows his brave/crazy side and challenges the seemingly unstoppable champion at WM, and is victirious. At WM 31 the "AMBROSE ERA" is ushered in
Oh, and Orton wins the TNA title or something