Why? As a total layman, wouldn't it be incredibly inefficient? If we tax the wealth of, say, the top 100 richest Americans, wouldn't that cause some pretty terrible downsides? If we force them to sell their holdings, wouldn't that ripple through the economy?
Take Jeff Bezos--if you forced him to sell a significant portion of his stock, wouldn't that depress the Amazon stock price, which affects a significant number of other individuals and businesses?