What I am curious about is if the unrealized gains tax will lead to more and more company boards being run by massive retirement / hedge funds such as black roc

What I am curious about is if the unrealized gains tax will lead to more and more company boards being run by massive retirement / hedge funds such as black rock. All these companies will then be essentially forced to the ROE / share price over all model as all the BlackRock's of the world care about is share value because that's what their customers want from them. When that scenario is combined with a massive economic shock, what happens?