I think that if there would be a nuclear war then Bitcoin can go down that fast as most of us may not care anymore if we have Bitcoin or not. We can not use Bitcoin to buy foods and other amenities if war would broke out. However, if there would be no major global disruption, then I think Bitcoin would not decrease in terms of value that drastic.

But if that would happen then I am sure that there would be so many buyers globally for Bitcoin and that would push the value again upwards. There are many people who are dreaming that Bitcoin can go down that low so they can increase their hoard of the number one cryptocurrency.