In my own opinion, Bitcoin in 2018 might face some problems like being banned in some countries but it woul prosper and it's value would go higher.
Bitcoin is perhaps the best known and most popular virtual currency and its value has rise reach to point $19,500 in December 2017 , but recently there are series of warnings from governments and analysts about the risk and volatility relevant to secure.Maybe bitcoin will be controlled by government in 2018