I think the price is heavily manipulated and the interest of people buying Bitcoin has been decrease, I think it's because the price plunge down since the high hype and a lot of investors losing a lot of money, nowadays poeple are prefer buying ICO and then perform dump to make profit
Thats definitely one of the reason behind the dump in price of the market but the thing which I believe was the reason behind the current bottom price the November holidays because most people usually sell than holding when it November-December. However,if you watch closely the date which dip market happened, it started acouple of days to this year thanksgiving.