Consciousness doesn't collapse the wave function per se. Consciousness collapses an image of the wave function. The collapse is not a necessary function of the universe, it is a necessary function of consciousness of the universe. As a result, consciousness is always necessatrily slightly out of phase with physical reality.
Actual reality is not necessarily the same as what is needed to construct a comprehensible picture of reality. The inherent lack of one-to-one correspondence is most likely exactly what is neccessary for consciousness to exist.
A unified theory is an oxymoron.