We can make it easy for grandpa by passing digital tax EU wide!

Kidding aside I think that would be great if it could pass

And pressure individuals like ICC judges by blocking them from US payment networks

Depending on the intricacies of tax treaties you probably won’t pay much US tax after moving to a high taxation country. Relinquishing US citizenship when you are wealthy means paying the capital gains exit tax on your worldwide assets though so if you can afford good accountants, keeping both is probably easier