In WoW they came out with a pugable raid, & in many peoples eyes it ruined the raiding community. It made people rage on new players, and visa-versa It also made people think raiding was easy and faceroll, & then they would QQ when they found the "real" raid too hard and demanded it be nerfed. Nonraiders or casual raiders are the majority of players in any MMO, and companies tend to cater to them. This is not a bad thing, as long as companies realize the raiding community is strong too, and lots of these nonraiders join the game cause their raider friends suggested it. Raiders leave, casuals leave.
They are adding a lot in this patch for nonraiders, and that is good to have a vast amount to do outside of raiding and just for people who don't raid. But if they start dumbing down the majority of their raiding content, they will see a mass exodus like what happened in Rift and SWTOR of recent past.