LOL.
Lets see. You do know that there is not central vault holding Bitcoin. So as the price drops that means it is being sold on exchanges. That means as people are selling and selling, there is someone on the other end buying and buying at these low prices and laughing. So for something to go to $0 in value it would have to mean that nobody wants to buy it on the exchanges anymore.
That could happen tomorrow. Once you lose the ability to sell, you lost all value. It happens to currencies around the world and stock, items that nobody wants anymore.
If you were a major investor, would you rather buy at 20k? or lets say 4k? Knowing all the applications coming out the next 2 years from blockchain, this might be your last chance to make another 10 billion dollars. This is intentional to scare the sheep so they can make money off of you. Keep selling to them while they get richer.