I think people are just afraid of market uncertainty and that the price may fall to the bottom. That's why people are afraid to invest now. As soon as the price starts to grow, many people will return to the crypto currency.
How much bottom do you expect from bitcoin, i think that bitcoin price is already trading in its bottom, i cannot see any further decrease in bitcoin price, but hopefully now the bitcoin price is going to start recovering its price, I think that it is now the best time for bitcoin investment, so we should not waste any more time and should try to enter the market in such a low price and conform some good profit after some time.