I'm not really a Cena hater, just a guy bored with him to the point where I don't want to see him main event for a while. But I completely disagree with the idea of his heel turn being epic or the most memorable heel turn of all time. You obviously don't know how huge the Hogan turn was, or other's in history, like Rocky(V1 and V2), or Austin.
People already hate Cena, and a heel turn will only change some of them, because some fans will still feel like it's too forced. But it will lose most if not all of the kiddie fans, because he would then become the opposite of what he is now, the anti role model and that crap he keeps talking about, loyalty, respect yada yada, would go out the window, much like it did recently. How loyal is trashing your boss and beating up his yes man, on top of losing the company gold.
A heel turn would be great, and refreshing more than anything, but it won't be Hogan epic. Not ever, because the crowd will always be split on Cena, where with Hogan, it was a completely unified event for EVERY, and I do mean EVERY single fan in the business at the time. It was like the sun of the company turned into a big ball of ice. It changed life as everyone knew it... forever.
Yeah I look at Cena like a solid mid-carder as far as his performance in front of the camera is concerned. But you underestimate his massive fan-base. Now, even I am too young to really say how things were back in Hogan's day from an adults perspective. He was MY John Cena. You couldn't help but like the guy, if for no other reason than that you were watching THE man in wrestling, which is exactly what Cena is today, love him or hate him. People suggest that Hogan was looked at a lot like Cena is today by the adult audience, but I'm not convinced. I think it was just a different time then.
However, if Cena gives us his best, and he probably will, him turning heel will at the very least be the second most talked about heel turn ever. Heel turns are usually not very big events from the fans perspective. Austin, & Rock... I know I saw it happen, but I don't remember them very much anymore. Granted some of that might be because I wasn't all that interested in the attitude era at that point in time yet. I was more of a WCW/nWo fan then.
Hogan's heel turn is arguably in the top 10 most memorable events in pro-wrestling history. Cena however gets so much flack for his tv persona and the older crowd hate him so much as a face that when he turns heel... sorry it's gonna be huge, and potentially even bigger than Hogan's. Not saying it will be, just that it has the potential. If Cena stays face for another 5-7 years, and then at the right moment commits the ultimate betrayal, yeah it could be bigger than Hogan at bash at the beach.
You are comparing apples to apples when you talk about the fanbase and what it means to them. Cena & Hogan have some similarities to compare, but they are NOT the same guy in any way shape or form. Cena IS a goody goody face of the company just like Hogan was. Hustle, Loyalty, & Respect has already reached the same heights as Say your prayers, eat your vitamins. You can't see me is just as iconic as that hand flip thing to the ear Hogan does. But Cena still shows signs of his 'thuganomics'/heel roots from time to time, and he says and does things Hogan never would have.
Hogan was, is, and always will be cheese, incredibly lovable cheese, but cheese none-the-less. Hogan reminds me of Ozzy Osbourne, yeah sure Hogan is one of the biggest stars of all time and remembered as a badass beyond all badasses, but in real life he's a bumbling goof. Not only that but when Hogan turned heel, his career was signed sealed and delivered as going down the toilet in terms of in-ring ability. Sure it was a massive boost that made him the most talked about guy in wrestling, and for some, I guess Hogan as a heel was a big success. But, (and I think this would apply to Cena as well) for the people like me who grew up in the 80's with Hogan as their iconic super-hero we got to see on a weekly basis on prime-time wrestling, Hogan turning heel sucked ass. I still to this day f**king hate Hollywood Hogan, and am just about the biggest mark you'll find for The Immortal. I get that it was great for business and caused big buzz and all that, but man. Hollywood Hogan as a gimmick (while successful) sucked from a Hulkamaniac's perspective.
Cena will probably deal with the same thing there. It doesn't matter whether the wrestling fans like or hate him before his heel turn, it'll be talked about and create massive buzz, and will be one of the most talked about heel turns of all time. Maybe even more than Hogan.