I was reading through the replies and was dissapointed to some or even majority who just gave their prediction. I don't know if they are just giving wild guesses but everytime you make a strong statement or conclusion, you need to support it by either technical or fundamental analysis or even both.
Anyway in my opinion, it is really hard to predict since it has gone far and high in price right now. I am actually affraid it may go down sometime next year with the rumors that the government may follow other countries who banned it already.
I don't know where you live, but most of us in " third world countries " don't trust our goverments so much. For example, I invested a little of fiat in bitcoin when no one in my country heard about it, and when Goverment issued a warning to practice extreme caution when buying Bitcoin, and generally took negative stance on crypto, I invested much larger amount of fiat. Goverment ban is basically a good thing to raise awarness of Bitcoin, because awarness, in most of the world is 1% or less, and we will not see full price without 50%+ awarness.
Anyway, yes I agree that in first quarter of 2018 the price will probably go down, to 3-4000, but simply because of the people who invested heavily in 2017, in hope of high return. And they tent to get nervous and drop at first sign of price declining. I see lots of that kind of guys lately.
So my prediction, 3000 - 4000 in January and February, and 12 000 - 18 000 end of 2018.