Dear Warren,
You have much deeper insights. I agree with you that corporate income tax is : "virtually impossible to administer fairly in our globalized world (from which we and the rest of the world have benefited ENORMOUSLY) "
It seems to me US has given latitude to corporate earnings abroad, at least since Panama was created. Given the control that corporations have through their donations, I doubt there will be major change. Due to the demographic change underway, mulinational corporations will likely earn more abroad.
Mayraj