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.
Actually the bitcoin in the year 2017 it facing some problems just like dumping of the bitcoins at banning also in the other country but bitcoins it was too strong because the value of bitcoins are increasing incoming on the month of december. It was good opportunity for the people holding the bitcoin on that month they get enough profit for that.