The major reason behind this is the number of stuck transactions which is why users are now driving all their capital to other currencies where they find better speeds and lower fees. Bitcoin already gained too much this year alone and proved to be one of the best (superb) investments of 21st century but that somehow became a disadvantage when the mining community became greedy and to show them that if they will keep doing like this, market-makers know what to do; they are now driving Bitcoins the wrong way but if we consider the surge in value, than what we are seeing should be considered as a nominal correction. $15k was set to be seen by investors (many of them were saying that a drop could come and value may soon be near $15k before the end of December) and they proved it. The local-no-confirmation-spam should now be stopped or miners should get ready to see more of this.