If it does happen even though the possibility of crash is something we are quite familiar with but falling down to zero is another ball game that would change the way things is being done. Of course the effect will be massive with a lot of people losing their money and investment but its a zero sum game because for someone losing, it means someone else is winning which would reduce the effect to a large extent. Lets just say half of the population will lose while the other half will win but the noise of those who lost will be the loudest.