Naxxramas

[ZugzwangZeitgeist]

In my opinion, the only reason that 1.10 wasn't Naxx was that Blizzard actually listened to the people in the forums, went "Oh man they're right.  We haven't put in progression for non-raiders since dire maul.  They need something".  It was an extreme lack of foresight.  They plugged raid instances (whether they be 20 or 40 man) into the pipeline, and didn't realize that the other content would be lacking due to this.
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I don't agree with your premise - compared to raiding, "other content" was not lacking. It's only with the release of AQ only one patch ago that raiding became even remotely as well-supported as smaller instances. The alternative to releasing AQ would have been to give ZG-style guilds no where to move on to, and to give BWL-farming guilds a couple more months of doing nothing and being extremely bored.

I know far more people who had never 5-manned Scholomance or Stratholme as of 1.10 than people who had never done a raid instance. To add yet another five-person dungeon would have been silly, even assuming that Blizzard could find some magical way to innovate a completely new experience that wasn't done to death in the other 5 dungeons.

If the last 90% of patch content was geared towards raiding, that's only because the first 99% of game development was geared towards soloing and small groups.