Let's put it like this..had they brought Eddie Guerrero over to Raw after his Smackdown run, there would of been no turning or getting tired of. His gimmick was untouchable and his peformances were the best in the industry. Cena stopped rapping, started talking about Chain Gangs, and never really lost despite the commentating making it seem like he was against the entire world. It was weird and you can tell that the fans were gonna tire of that bullshyt really quick. It was like the Anti-Steve Austin.
I always liked Cena but he would never lose (except to edge and kfed

) he would seem to get beat up every raw and then of course at the ppv win every time after taking a ridiculous asswhooping. And while it doesn't seem that bad on paper it was

it was trying to sell territory style booking to a more distinguished crowd who grew up watching the attitude era ,ecw and eventually roh. Wwe still refuses to put anyone up on his level also as if he's the Rock or stone cold .
The summer of punk would of been much better if they had punk feuding with laurenitis and hhh as like new antiestablishment hero ala Austin he didn't even need the belt for that . But no they decided that Cena/big show clearly made more sense as if you would fire Cena to push big show

that made no damn sense
Cena could play up his shilling even more and become a corporate yes man type of heel not necessarily doing ,ich different