Nope that will never happen.
Bitcoin will not go down lower than 10.000$
It is very possible it can go down below $10,000 but it will never go as low as $1,800 again. We all have seen that this cryptocurrencies is a good fighter. Many expect the last dump to push bitcoin down close to $5,000 but the bull take the price back near $13,000. I will love to see bitcoin go as high as $60,000 in 2018.
What is the basis for having a $1800, at the end of the year 2018 it was already predicted that it will probably double or tripled in price compare to the price last year, may we encounter suffer from crashing the price down but it won't end the year with a negative outcome. This is a pioneer industry and for as long as other crypto currencies are rising bitcoin will surely rise as well as it is a solid currency.