The price won't fall down to such levels overnight. But the main thing that makes certain people go all in, is that they think the price will go up guaranteed because of Bitcoin having a good future ahead. They don't know how to calculate risks. These people mostly end up selling their coins in panic to prevent even bigger losses. It's sad, but it's the reality. These people should stay very far away from any kind of investment.
It is nonsense to say that bitcoin will drop much deeper with that much marketcap and a large community of the world having investment in it, we have already faced the situations of price drop and we are the evident that the price of bitcoin when started to decrease then it take a longer period to drop like in the previous month the price of bitcoin started to decrease and it dropped from $650 to $550 within a whole week. Those who will stay with bitcoin for long term will not face any lose with bitcoin investment.