If bitcoin is continue to go at this rate then it may hit $20K by January 2018,but there is a fork coming up so it may influence the price of bitcoin and high chance for bitcoin price fall.The bitcoin reached $14K in just few hours and altcoins are dumping so from this we can assume that all altcoin holders are transferring their coins to bitcoins to get that free coin.Maybe after got free coins they will return to altcoins so there is high chance for bitcoin price fall after the fork.
Is definitely something that cann´t be predicted the great rise in the price that it had in the last few weeks perhaps still does not consolidate as such, maybe it's best to wait until the end of the year to have a better opinion about whether it could reach the $20k, but perhaps the difficult thing would not be that it reached that point, but could be maintained at that price, but every time the graphs are observed one imagines that the price at any time can come down but only from the current perspective.