Go away, American millionaires.
That’s what some of the world’s largest wealth-management firms are saying ahead of Washington’s implementation of the Foreign Account Tax Compliance Act, known as Fatca, which seeks to prevent tax evasion by Americans with offshore accounts. HSBC Holdings Plc (HSBA), Deutsche Bank AG, Bank of Singapore Ltd. and DBS Group Holdings Ltd. (DBS) all say they have turned away business.... Source: bloomberg
Well millionaires/billionaires would have no problem renouncing citizenship without loosing (and perhaps gaining) advantages of doing so.
I am sure there are lots of countries that would grant citizenship to those millionaires and billionaires. Some might even fast track the process down to a couple of days.
Perhaps we need to add to the statue of liberty's quote:
"Give me your tired, your poor,
Your huddled masses yearning to breathe free,
The wretched refuse of your teeming shore.
Send these, the homeless, tempest-tost to me,
I lift my lamp beside the golden door!" and you can have our rich and wealthy in exchange.