A year ago if you read that a Paladin was main tanking a raid, speculation, QQ, complaints, mocking, and about 100 other responses would come flying from all directions.
A holy Paladin is and has been a welcome addition to any raid already, it's been the desired spec for many guilds to seek.
Retribution however is still shunned for the most part. True you see them placed here or there. But you don't see them often at all.
There's 2 specs that have grown into viable,usable,welcomed,desirable ways to play and raid with. Retribution however is still behind. With many classes theres 2 ways to go. By that I mean clear different paths of playing. With a Paladin you have the choice of Healing,Tanking,Melee Dps in a nutshell. With A shadow Priest you have DPS, and Healing. With Warriors, its dps and tanking. So on and so forth.
WOW EU posts by blues, and even Blizzcon panels have brought forth the issue of retribution in terms of being attractive in a raid setting.
Once that had been mentioned it made a gigantic wave. It sent many people into planning what they were in the end going to do. Now there was this hope of sustained Dps to bring into a raid. Some wondered if every pally would instantly go ret? Paladin's looking to respec to retribution wonder what the changes will be, the ideas that are surfacing stagger the imagination.
However with the Protection community settling down we clearly see that not every paladin jumped on the bandwagon to respec prot and turn the world upside down. So its safe to bet that not everyone is going to run to retribution, maybe a flavor of the month will happen, but that's something that nearly every change to any class will do. However it's not going ruin raiding at all it may even enhance the raids, who knows at this point what changes are in store but its healthy that positive sturring is going on in the forums.
The most stressful, yet provides the most gratification..