Leaving the country and working elsewhere is often not as easy as just packing up and leaving. One still does have to report taxes back to the US and you will have to attain necessary work permits to work outside. While there are many perks/loopholes created by being allies with several countries throughout the world, like any naturalization process it takes time for things to get done.
That being said I have no idea why this has become a political/bashing thread. There is a large amount of negative energy spewing out of a good majority of these posts... I am staying out of this thread!