The reason WWE won't add any show that is not PG rated is because they spent a veritable shit ton of money promoting the fact the ALL their programming is family friendly. While Linda has political ambition, John Cena is an ambassador for Make a Wish and WWE support B A Star there WILL NOT BE ANY NON PG SHOWS.
As a side note, who actually enjoys seeing people smash each other over the head with chairs or secretly take a razorblade and cut themselves to bleed? I'm 30, so I saw ECW and the attitude era. I've also suffered concussions and facial lacerations (potholes and bicycles don't mix) and I saw the fall out after the Benoit murders. I watch old wrestling now, or CZW, and cringe at what they do to each other. I've said before if I want to watch people mess themselves up for no reason there's Jackass and Dirty Sanchez, wrestling doesn't need extreme violence to be good (see Daniel Bryan vs Dolph Ziggler on Monday's Raw) nor does it need homophobia, racism or misogyny.
WWE can remain PG and produce fantastic, enthralling TV (the summer of Punk, Wrestlemania 28) while showing some of the best pro wrestling in the world. When they don't, it's not because they're PG it's because their writers suck.
(Sorry, I have a headache and I'm ranting, I know.)