Elon Musk's net work is at least $670 billion.
If we implemented a 1% wealth tax, the US would collect $6.7 billion from this one man alone. Elon would still be the wealthiest person in the world.
To put that into perspective, the bottom 50% of wage earners in the US pay $63 billion in federal taxes.
A 1% wealth tax on this one individual would support the US government as much as the taxes collected from 8 million modest earners.