Where do you draw the line?
A retiree that invests well and owns a home can easily end up with well over 10 million.
I'm fine with a billion but I find it gets tricky below that. Since a billiion is a very large magnitude above the mean.
I'd rather push for philanthropic efforts rather than force people to do weird things like setup trusts for every heir that sits just below some limit but remain funds they still directly control by being the trustee.
If the goal is truely to prevent being able to possible accumulate those amounts then we're looking for a different economic system which is fine but then just say that.