99% of ICO investors were following CfB, David and Dominik were never the draw cards, they could both be replaced tomorrow and easily replaced with seasoned tech entrepreneurs, whereas replacing CfB would be impossible. Who cares about personalities anyway, if David is as toxic as you suggest he won't last long in a foundation where bullies will get ejected, even founders. IOTA is bigger than any individual now, except maybe CfB until the COO is safely removed.
I think you only got half right. If cfb is a tech genius, David and Dom are the business genius. A successful venture can not be without both and the business genius such as Steve jobs and mark zukerburg often time are more important than the tech genius. A good example is NXT. NXT had cfb but did not have David and Dom as the business leaders. David and Dom are as rare as cfb, Vitalik, and Dan Larimar in this space. They have different skill sets.
Just as in a successful startup, you only can replace those founders when the enterprise becomes matured and stable. Jobs in Apple and Gates in Microsoft can be replaced at some point when the companies got matured and stable and running like a machine.
It is also like building a kingdom or dynasty. In the early stage, you need warriors to build the kingdom. They can kill and fight and be ruthless and doing things mostly based on instinct. After they conquer the land, they can be replaced (in many case better to be replaced) by the more civil managers with good administration skills.