Take my example. I currently live in Switzerland and am now moving to California, for entrepreneurial reasons.
But I must say it has become less attractive if you look at the Swiss Franc to US Dollar: http://finance.google.com/finance?q=usdchf
In 5 years the Dollar has lost 25% ! That means that now Americans in average are 25% poorer compared to Switzerland than they were 5 years ago.
And the worst that can happen to America is if the smart, driven and hard working people it has been attracting for centuries stop coming. They are the ones that drive America's growth. And with the dollar down the tubes they might think twice before following their American Dream.