It would be a terrible thing if the Bitcoin pattern is the same as in 2013-2015, it could be the end of 2018 is only about 4000 $ -6000 $, as I think if it might happen?
Let's look at the pattern in 2013-2015 below:

and this is the pattern from 2016 to the present:

What if it really happened, give your opinion?

Anything could happen on the prices, it could either go up or go down a lot depending on the events that will take place this year. News and events are affecting market demand because people decide whether they will buy more or sell their holdings. Let's just see what 2018 has in store for bitcoin. I am still hoping that bitcoin will continue to grow more.