Even if you were to liquidate every billionaire in America, at a 100% tax rate above $1 billion, and were able to sell the shares at current stock prices without a collapse, you would pay for the government deficit for... 3 years. Because their combined wealth, on paper, is $7T while we're running over $2T shortfalls every year.

3 years of not taking out debt, while still needing everyone else to pay current rates. Then you're back to square one. Sans billionaires and sans any major capital investment anywhere.