How do you imagine this would work? Would no one in America found companies anymore? Would the government sit by and allow the to leave? How would companies like health insurance leave?

Imagining that the richest can hold a country like the US hostage is preposterous.

They're welcome to leave. Society doesn't need rich people.

Destroying the system would do more damage, but so far it's been their system that enables their accumulation of wealth. There are a lot of poor people who want to destroy that system.

No, they would try to make a bunch of shell corps and have only 1% in each corp. Distributing the wealth (to other entities that they control less directly). It would essentially just destroy brand recognition for large companies.