I think at the end of 2018 Bitcoin price or value will reach $50,000 well now that its price increases rapidly and unexpectedly. Also i think Bitcoin will become acceptable in some country or it will become legalized by government. Many people will also willing to invest on it and try to use it in some transaction. Some stores and shops will also accept Bitcoin as a payment or transaction
Your assumption is exactly right because I am also expecting that much rise in next year but bitcoin is basically unpredictable and nobody knows what will happen next so only we can wish to see high prices maybe it will go far than 50k or maybe it ends with some value near to the 50k every value is depending on the investor interest and If more no of people will come then maybe it will go above the price you estimated,