We are talking about bitcoin which is an asset which is very volatile so such a drop even if it is unlikely it could happen, but it is not very realistic if you ask me to expect that it will actually happen, and even if it does do you think other assets in the market will be doing any better at that point? It is very possible that for such a crash to happen we will need to see an economic crisis like we have not seen one before in many generations, so if I were you I would not worry too much about this prediction.