Imagine a world where we are all by default on sustainable MDMA-like states of consciousness. Twitter would be full of people complimenting each other and seeing the best interpretation of each other's content. I love the world and the world loves me; we make a great couple. <3
There is depressive realism, yes. But also there is meta-cognition and rationality. I think it would take some time, but people would adapt. In the case of assessing big risks, people could always tune to other states of consciousness for such tasks.