Interesting view. (1) I would say consciousness is useful from the social point of view since we can explain our actions and change other's. It's an evolutionary advantage that we can exchange lower level information between us and not just 'act' as the only causality. I also can say that, as we are not very efficient analyzing every situation, we have some feelings, sensations, and gut instinct. The fact that we are conscious and can get input for the conscience of others and act against this instinct also has evolutionary advantages. I understand that in an hypothetical world with no randomness things are predetermined but it's still a chaotic system and the interactions we have with each other affect the behavior of the system. Being conscious changes these interactions and is still an advantage from the evolutionary point of view. (2) I'm not disputing that there is quantum mechanics black magic happening in the world and randomness - although i'm not an expert in this, it seems to be well founded and experimentally testable. Wouldn't it be enough to have randomness around us and in some chemical processes going inside us - without our brain being this machine to do amplification of quantum effects to compute incomputable functions, like Penrose defends?