I have raided in World of Warcraft since the beginning. Raiding has always been a big part of why I play the game. If not the reason I play, certainly a reason. So when I was sitting up last night and it occurred to me that I've never gone an entire expansion without raiding, I didn't initially think anything of it -- to me, raiding is what you do in WoW. But then I started really thinking about it. Because lots of people don't raid. Before the rise of LFR and flex, a lot of players -- the majority of players, really -- never set foot in a raid at all. They had 5-mans, and that was basically it for group content for them outside of PvP.
So I started asking myself if it would be possible to release an expansion with little to no raiding content at all. Would players accept it? It's a cliche (and an overused one among the community) that Blizzard didn't do this or that 'because it would cost us a raid tier' but let's really consider -- what if we could have the expansion next month, but it wouldn't have any raids? Would that be an expansion people would be willing to play?
One of the reasons I consider this a more controversial question that it would have been at the end of Wrath is because now, raiding is far, far more accessible than it was even then. With the advent of LFR and the recent development of flexible raiding, it's never been easier to raid than it is. While Warlords of Draenor is changing the raid game, those changes will only make mythic raiding in any way more restrictive -- the rest of raiding will remain very accessible.