Because people are opening their minds to something even more magical...
Because there's no real love in it anymore...<br />
«...Woe, when a religion dies, and from a real living power becomes a clamorous exterior pantomime, an empty thing behind a painted scenery, behind pompous garments, the movements of devices performing certain actions, just as a key activates a spring, but neither key nor spring is conscious of what they do. Woe!...» − The Poem of The Man†God. Chapter 630.
..........Well as for the shakers they refused to have sex so they just kinda died out