Let 'em go. It's not like they're contributing. I refuse to respond to fear tactics.
I don't think you've thought this through.
They ARE contributing. They don't just sit on that money, they INVEST it. That means it is available for capital or loans, to expand businesses and start new ones, thereby creating more jobs (and preserving existing ones).
If they take their money to another state, or to another country (an island republic, or one of those little countries with no income tax), and we lose out on the capital investment they represent.... then yeah, we're going to have problems. That wealth is no longer going to be there to use to create MORE prosperity, as in for you and me.
I don't know where people get the idea that a man worth 400 million dollars, simply has a stack of money that he's sitting on, hoarding it, and it isn't doing anything. I know a number of wealthy people, though I'm working-poor myself, and none of them do that. They own businesses (that employ people!), they INVEST in businesses (that EMPLOY people!!), they buy stock in businesses (that EMPLOY people!!!), etc.
Why do businesses sell stock? To increase capital so they can do more biz, which often means hiring more people.
When you lose the wealthy, you're hurting your own economy, and everybody down to the dirt-farmer and the ditch-digger.