All things can happen, usually every end of the year before natal bitcoin prices always skyrocketed, last year the price of $ 1200 before christmas then drop to $ 900 month of january. this year is likely to happen again.
Prices are unpredictable now because who knows at which time demand will low or high the only thing I can assume about 2k18 is that year will be full of surprises and prices will go more higher so be ready to take advantages the fall is here now and get your coin at only 13.5k and this will take the price to the 18k in next two days and this is sure that upcoming time will be more fascinating to the newbies as usual,
Yes, in fact those are quite unpredictable as seen in recent weeks, right now the situation is a bit uptight to call it somehow because the price may experience a fairly steep drop or on the contrary increase more considerably by perhaps putting the value above $20k, but still the situation would be quite tense, because almost everyone would be waiting for a fairly strong correction from one moment to another, towards to 2018 the price can go up and down repeatedly but in the end it could close with an increase maybe.