Normally I would post this somewhere in the BoD comments (HUSS!), but I figured it might warrant it's own post. Here's something for everyone who wants Cana to ever turn heel: Chris Hero just dropped on Rosenberg & The Masked Man's 'Cheap Heat' podcast that they actually had a plan to turn him heel after Wrestlemania in 2011, after the 1st Rock match was announced (and probably specifically for that reason). Cena spent $5,000 of his own money on new gear before being told they changed their minds & he said they decided he would "officially never turn heel."
Now whether that still stands after his merch numbers start to fall (if they ever do), who knows. But for all the theorists, there was at least an official plan at some point in the fairly recent past.
I would be somewhat dubious towards the veracity of that information. But it's certainly been discussed before, no doubt.