Fandemic

Pronounced: Fan-dem-ick
The never ending cycle of a fandom's devolution from a respectable group of fans to a group that relies of shipping, fan-fiction, and inappropriate content that eventually leads to the destruction of a fandom.
(JackAttack on Youtube came up with this magical definition)

J: Jeez, its a shame Five Nights at Freddy's fell to such a fandemic state.