Really interesting points raised in this thread.
According to the statistics, LFR and Normal are the vast majority of the raiding player base.
And the raiding player base is a bit over half of the entire player base - since 40% of players never even did LFR, let alone other difficulties.
It really makes an interesting point as to what purpose raiding has in WoW.
Sure it should still BE in WoW, but seems raiding no longer can justify being THE ONLY THING that gets new content during an expansion.