Bitcoin is old, outdated, slow and uses too much energy. The price will soon be brought down to a level where miners will abandon it. Prices will continue to be kept lower due to CME futures.
So CME futures. 
Anywaywinter is coming.
It seems that the absurdity of the past week "BCH fork" due to greed led to this decline and then altcoin dump could cause more losses in the short term "this week."
I expect that whatever happens $ 4,200 will be the bottom but things are not so bad "the price will recover quickly."