Earlier quoted context omitted.
Inheritance taxes on their own will do nothing to change the situation because then you'll simply concentrate all the wealth in corporate structures that transcend the death of their owners. Even if you make it impossible to 'pass down' these structures as property, you will have de-facto inheritance through nepotism and clan structures.
I agree (and I suspect tomp would as well - it's generally best to give others the benefit of the doubt when they've been silent on an issue) that estate taxes are insufficient. I disagree with the implication that they are not a critical component of a solution.
So, even if they are a critical component, they are irrelevant unless someone can articulate how these other components would work.