The market will address by the wealth moving to where the wealth tax isn't.
Then the countries will start creating ridiculous exemptions and they become nothing burgers (e.g. see Switzerland's wealth tax).
Sure, we all agree.
The solution is pretty obvious, just implement a wealth tax that prevents capital flight.
It’s not that hard. The US already taxes its citizens abroad. A well-implemented wealth tax would be charged regardless of where you live or where your money is. If you are a US citizen you get taxed. Then you slap an exit tax on citizenship revocation and you’re good to go.
Not hard, simple, we already have systems in place to enforce it.