Seems like the first step should be taxing those personal loans that are being used as income. That seems like a simple fix (simple by tax code standards, I’d still expect such a law to be ridiculously complex).
I do worry about the unintended side effects a of a wealth tax targeting stock ownership directly. That just gives the rich an incentive to squeeze more value out of their investments in order to cover their tax bill. And it seems like it would likely push private companies into selling out more as they grow since the money has to come from somewhere, thus giving even more incentive to cave in to investors who just want to make a quick buck and don’t care about the long term survival of the company.