Ramifications of new “Ultra-wealthy tax plan”?

Elizabeth Warren (and like 50 other dems) are proposing a 2% wealth tax on folks worth more than $50 million – with a 40% exit tax should billionaires try to flee the country.

Details here https://elizabethwarren.com/plans/ultra-millionaire-tax

It sounds great to me, with my lay understanding of economics. I’m constantly being reminded that I have a much higher effective tax rate than the richest people in our country, and it DOES feel like the economy/system is rigged against the middle and bottom.

But, is this a viable solution?