Not sure that's the case, having and keeping wealth are different things, most people who get wealthier from bitcoins rise will exchange some or much of that coin to buy the life they want, even BlackRock holding it isn't that big a deal, they'll have to use it eventually. Eventually wealth will find it's way to people who produce value. There's always going to be a disparity between the wealthiest and poorest in society though. Bitcoin won't fix that.