The dollar collapsing will be like the a tangent function. It will never collapse, but it may get increasingly more fragile and internationally decrepit. The Euro, on the other hand, has a strong chance of collapsing, especially is the Greecian pull-out fails and then Spain falls. The only way for it to survive that would be the EU kicking Spain out or kicking the Euro out of Spain (what did they use before that? Peseta, was it?).
Nothing. Not because I have confidence in my aforementioned assertion but because I am honestly in a financial quagmire from which I can not do anything in retaliation/preparation.