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That would already be the rational choice, if it was. There are countries with lower taxes, yet the economic activity isn't flocking to them.

If they think that they can be as economically productive in a different country without American citizenship, then they should indeed do that.

Do you think that punitively incentivizing the most economically productive people to leave the country results in zero consequences?

The US taxes non-resident citizens.

And citizens can abandon their citizenship if they feel it is worth it.