We've known for years that Cena is stale and the company has forced him upon us out of an unwillingness to change it up. 2015 will essentially be the 11th straight year where Cena is the top dog (though this is GREATLY the fault of WWE for not building new stars). Just think about that for a second. Rock and Austin's meteoric runs at the top lasted what, 4-6 years (and they were way more over than Cena)? And beyond that, he's spent that entire time as a face (loose term of "face" though) who's character hasn't changed one tiny bit since 2006. At least the underdog crap that they ran with for so long has subsided (because really, how can he be an underdog when he wins more than anyone on the roster?).
WWE really has no excuse to not have turned Cena heel any time in the last 8 years. Austin turned heel at WrestleMania of all places and it turned out well for business. It would have been so easy to turn him: the loyal company man turns on the fans because of the lack of appreciation for his hard work. And guess who would have been the perfect face for that heel run? 2011 CM Punk, the antihero to Cena's "company man" heel character. Thinking back on it, they really did drop the ball on that storyline in a number of ways.
And maybe the last decade of him would have been more bearable if he was good in the ring. I don't even think he's average - below average, I would say. To be fair to him however, they have cut him down so much in the ring that he rarely ever gets to show his real abilities (and that started in about 2005). Watching the match with Rollins from Monday made me realize just how little offense Cena ever gets in his matches. 90% of the time the only true offense he gets in are his signature moves. I know he's supposed to be the face, but it has never helped his character all these years to produce such little offense in his matches (RAW especially) when he's the best wrestler you have in kayfabe.
It's just incredibly sad for me to watch RAW with John Cena 2005-2015 still operating the same as ever. Same boring character, same "never give up" storylines against more entertaining heels (where he predictable goes over), and the same "moral high ground" promos where he ends up yelling and screaming and not making any sense. Besides, you really can't claim that you will give someone a big beat down when you get beat down yourself for 95% of a match.
I really long for the day when he's off our TVs. But at this rate he'll be wrestling main events until 2020.