I don't think so.
If you remember back in the late 90's WCW, the nWo (heels) were cheered while a lot of the faces were booed. The business evolves. As long as they are getting reactions, that's what counts. With Cena especially, I think it's got to the point where it's fun to do the back and forth chants. It's like when Kurt Angle was face and people still chanted "you suck".
Fast forward to today and you have to add a couple more things to that factor. Jericho's current comedy heel act has endeared him to the fans (his previous heel run was genius and he was genuiney hated). Then you have people like Owen and Styles who are indy darlings and so will have a large portion of the crowd cheer them while others catch on and follow. It's not abad thing, it's just the evolution of the business.
You still have a few pure babyfaces (Sammy Zayne, Daniel Bryan) and a few pure heels (The Miz, Charlotte, Alexa Bliss). With Miz I'm not sure whether it's x-pac heat or he really is that good, but Charlotte is definitely one of the best heels in the company.