No context, just grating and almost whining in pointing to things that cannot be taken at face value. I'm genuinely saddened that people will read through your post and think themselves more informed about the state of raiding since Wrath of the Lich King.
In the interest of making sure this is a constructive post, at the absolute least take out your abysmal commentary and instead add two things:
1) Graphs for middle tiers.
2) Explanations on each individual tier and the exact state of the game at the time of progression.
If the second point seems daunting, that's because it is. Challenging 5 man content in early Cataclysm and rather inaccessible raids early-on pulled an astronomical majority of players away from playing that facerolled through WotLK. Pugs that could be found at all times of the day were now scrapped in favor of guild perks. And in the final tier, LFR was added. No matter how you slice it, this did pull players away from doing normal modes, and still does. The people that cite scheduling issues have perfectly valid complaints, but even they are not immune to the simplicity that LFR offers. LFR offers laziness, where normal modes do not. Pandaria has had LFR throughout, WotLK and Cata did not.