The plug was pulled on WoD due to massive sub loss.
- Flying debacle (Blizzard’s first attempt at removing flying was in WoD.)
- Raid or die (The implementation of the solo play Garrision playstyle.)
Questing was great, but about 3 to 6 months in there was a massive drop off of subs as people discovered that unless you were going to go on into Raiding there wasn’t much group content for the casual crowd.
The six month mark was when the casual/social guilds I was in really started to nose dive.
WoD really was the social/casual guild killer expansion.
Here is a post of mine from another thread about WoD impact on guilds: Is WoW out of touch with it's core audience? - #89 by Kholin-drakthul