Basically, it already has led us to some kind of crash. However, fortunately, we handled it and nowadays we still struggle with those changes which happened to the market because of coronavirus. In my opinion, traders and investors always have to be ready for such things. Investors should keep the most part of their invested money in reliable assets, but, corona affected even the most stable assets when it hit our world.
Nevertheless, investors might face much more losses in case they wouldn't think about their funds beforehand. I suppose that we handled first several waves of corona with minimum losses, but not al of us of course.