I hope this will never happen of course, but for who have invested capitals, it may be a question someone have answered accurately to avoid an important loss.
Bitcoin price drop shouldn't be something to worry about because it will surely rebounce. It is when you sell during a price drop and you bought higher than that price that you will be in loss, but if you don't sell a dime, you are not in loss. The odd of bitcoin price going up overtime is higher than the price going down. This means that it's easy for bitcoin to reach $1m, than going to zero.