Applying the trend of the past four years to today as a starting point for the next four years. During the past four years, BTC:USD rose x18 in a characteristic pattern beginning with a brief parabolic bull; a protracted bear; and another more leisurely parabolic bull run. I take this pattern and begin it again at the peak of the Dec 2017 using the same time frames and bull/bear price factors. The prediction is for 384k BTC at the close of 2021. Strategy can be implied from the graphs, but short/neutral in the short term, long for the long term.
I think this drop is a pedestal for future rise.