I have seen similar topics in this forum. But the answer is that we don’t really know. Nobody knows the lowest price BTC will reach, all they can do is predict what price they think Bitcoin will actually drop. Last year I once saw someone that commented that Bitcoin will in this 2018, and that it will drop as low as $2,500 and then people will see it as an opportunity and start to invest again, and from that price rate it will climb up above 2017’s highest score.