This top 5% of which u speak can be described as the players who play Wow for the challenge, they want to compete and "beat the game". This type of player is becoming rarer in Wow. There is a very viscious hostility against achievers in Wow these days, which is why u will rarely see anyone from this demographic posting on the forums.
Do u think that it was the players who asked for yet another difficulty level of raiding somewhere between LFR and normals?
Or do u think it was Blizzard needed to give everyone something else to do to occupy their playtime and created yet another system of recycling content?
I wouldnt be surprised to see another future feature to Wow which is simply another manipulation of the same Raids. More gear to give players the impression they have more stuff to go and get...