No one knows, and no one can be sure what price it's going to end up. Though I've read a lot of so called "experts" that are predicting $25,000 at the end of 2018. I have no comment on that. It could be $50,000 it could be $5,000.
I don't know how does the popular people and analysts predicted bitcoin as $50,000 in the end of 2018. Maybe, they used technical analysis or they are just attracting the people to buy lots of bitcoin in order for the price to climb up. But I think their prediction will come true.