Not everyone will agree with me, but I would say it was something all of us expected it even though our dreams are only bitcoin's price goes up. Last days before the end of 2016 we observed bitcoin to win about 25% of its annual growth due to the devaluation of the Chinese yuan and the imposed capitals control. After a few days price stabilized at about 880-920 USD till today we see a sharp decline particularly in chinese market. If there is not a major intervention from Chinese government the big players sell to buy after that as much low as possible. Imo it is a chance someone has money and bought high $900-$1000 or even higher that now might be best time to buy so as to reduce the loss.