I think will go down to $800 in March and climb back to $1800 by the end of 2018.
You mean that Bitcoin will become worthless ? 800$ for really dumb-ass?
If bitcoin drops to $ 800, then the forum may be less than half as bitcoin will drive other cryptocurrencies down together and the cryptocurrencies will be red every day, and I do not think many will ever be able to withstand such a blow .