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.
Drastically drop is not saying it all, because we may not understand your full intention on what the world may convey on mean to you by using it in this context, bitcoin has always been a volatile digital currency, which means you can discover some period of low or high volatility and these shocks always occur when there is an event of breaking news or when the investors are moving their assets from one point to another, so we can say bitcoin has always been falling drastically as well as rising rapidly, but when it falls, it surely rises, don't expect having the same intention as we may develop for the altcoins which some may not rises after their fall.