Not in definitive faces and heels as it has traditionally been, but in characters that are only faces to those who agree with them, and characters that are only heels to those who disagree with them.
These days, and ever since the attitude era really, it is very hard to predict exactly who the fans will support and who they will hate. Take Stone Cold Steve Austin for example. Stone Cold was meant to be a heel, but everyone cheered him so he was pushed as a face. DX committed similar acts to Stone Cold at the time, and yet they were booed.
Now if you look at wrestling recently, you have the number one face John Cena getting booed at Wrestlemania against top heels like HHH, you have Randy Orton being half booed and half cheered depending on who you listen to.
Then take someone like CM Punk and the Straight Edge Society. They were heels but I seriously loved them and wanted them to convert everyone on the roster.
Also, just from a practical stand point, if all of your wrestlers are likeable to at least one demographic, then you will appeal to a much wider audience. Personally, I haven't watched wrestling regularly since about Wrestlemania 18, but when CM Punk and the Straight Edge Society were around I watched it every week and got all of the PPVs too. If I tune in and the WWE is pushing a violent beer drinker with a foul mouth as their number one face, while at the same time ridiculing more conservative characters as heels, then I am unlikely to keep watching. However, if they give credibility to both types of characters, then I will keep watching to see my guys take down the guys I percieve to be bad. Then, even if my guys lose I would still keep watching in the hope that they would eventually over come the bad guys and win, just like I did keep watching during the attitude era hoping that Vince McMahon and his corporate team would beat Stone Cold and DX.
Therefore, I believe that the future of professional wrestling lies with characters that are both loved and hated at the same time by different demographics. It would give the WWE writers more freedom to make 3D characters and it would attract a much larger and much more emotionally invested audience.