They're worried for several reasons. The biggest is, what if it isn't dropping because of the Saudis, but because of a weak economy in China? And what if that s

They're worried for several reasons. The biggest is, what if it isn't dropping because of the Saudis, but because of a weak economy in China? And what if that spreads to the rest of the world? Additionally, the lower oil prices wrecked the income of a number of state and national governments that just assumed the price would stay that way for the foreseeable future.