I would suggest that you check the historical price of bitcoin dating back maybe 2 years or so and you will see that it is common for BTC to fluctuate. Given that it goes down dramatically if there is FUD like banning or regulations being implemented. Vice versa when there is good news. But as the saying goes, nobody can tell what 2018 holds for BTC. What we need is faith in the technology and patience.
I dont think 2018 will be the end of bitcoin, bitcoin is under target that's for sure, tthat's why th bankers are trying to push ripple to try to make bitcoin fal, but i dont think it will happen