Source: Ghostcrawler, Lead Systems Designer
It's awesome that so many players have adopted the "bring the player, not the class"
mantra. I think we managed to get that message across. Do remember however that its original context was that after you have the major buffs and debuffs covered that you will have room to bring who you want and generally a lot more flexibility on which classes you need to bring. It doesn't mean that you can put together any kind of contrived raid comp and then point the finger at us when your 12 prot warrior group wipes in Ulduar.
But that also doesn't mean we are reneging on our promise that you can MT with any of four classes. Just remember thing are going to feel the least equitable on the hardest fights.