Bitcoin's market price can fall so deep that noone of us really knows how deep it will fall down because bitcoin is volatile. But so far, bitcoin has only fall to 6,000$ and goes up again and again. Just remember that there is money when its market price goes down so deep.
In my opinion there is not much room for the price go lower than that, right now the price is barely above 8000 but it seems that the worst part of this bear market has already passed and if for some reason the price were to go lower than 6000 then it is unlikely that the price will go that much lower and the reason is very simple there is still a lot of people that believe in bitcoin and in what represents and as soon as bitcoin touches those prices those people will begin to buy like crazy, the only reason why I would not join them and buy if that scenario presented itself in the short term is simply because I lack the money to invest in bitcoins.