In my opinion, I think the bitcoin will not be able to reach the $ 50k mark by the end of 2018. I hope it grows slowly and slowly, I do not want the bitcoin to be pumped. Investors have so predicted that because bitcoin has been well known, pumping is a form of waste at the present time. But the price of bitcoin can rise to $ 250k by 2018, which is a prediction by Tim Draper. I fully trust him.