[dalke]

We're talking about expatriation. It's difficult to live as a stateless person. You really want to have citizenship in another country before giving up US citizenship.

While permanent residency might be a possible substitute, the lack of any citizenship will likely make it more difficult to travel to another country, and there may be legal problems should you have a child as a stateless mother.

[klipt]

True, assuming you're not a dual citizen to start off. Some of the Americans moving to Europe might already have a European citizenship by descent (although not necessarily of the country they end up settling in).