The charts posted on the frontpage show that although approximately 60% of the playerbase seems to raid (LFR included), it appears that only 2% of those are actually doing flex or normal-mode raiding.
Back in TBC 2% was approximately the number of players that cleared Sunwell and in Vanilla this similarly was the number of players that cleared Naxx40. This was the elite of the elite, best of the best, in those days.
It's rather odd to see that Flex and Normal mode raiding has become just as exclusive as cutting edge progress raiding was back in those days.
It's also pretty obvious how people are very much not interested in organized raiding or raidshedules and that many people stopped normal mode raiding the moment LFR was added to the game.
Perhaps Blizzard would be smart to recognize this and to start focussing on making LFR / queueable content more the main content and reward of the game than expecting people to commit to raidguilds and their shedules.
Mod edit: Changed title to reflect actual situation