Shouldn't be an amendment, but we should impose a "securities" tax to achieve something like the $1 million limit on personal wealth.
An annual, 1% tax on stocks, bonds, mutual funds, and other financial instruments, payable in shares of that security. (Which will then be slowly liquidated on the open market, such that the liquidated shares never comprise more than 1% of traded volume in any given time period)
The first $10 million directly held by a natural person are exempt from this tax.
Wealth isn't problematic in and of itself. The issue is when wealth is used primarily to purchase wealth-generating assets, rather than the products and services that generate wealth for workers.
No make it an amendment so the rich who want to be richer have a much harder time abolishing it. And since you can't stop the worst people from getting rich, it's better to do an across the board blanket ceiling. If you can't control the assholes, you have to say least throttle them.