We should keep Bitcoin for December this year is very accurate. By the end of the year Bitcoin tends to appreciate probably due to the influence of many factors such as the Christmas effect and perhaps our community's expectations for Bitcoin's price increase. I will buy Bitcoin and keep it until December of this year.
No I do not afraid to hold my coins till December 2018 because I think that is nothing to worry about it. The price is quite good and will increase gradually. It is the best chance for new investors to put their money in bitcoin and earn big money in the future. I will hold my bitcoin till the price reach atleast $20000 again, no matter how much time it will take.