I think agnosticism is a very reasonable position on almost any subject including consciousness. In the face of any real mystery, I think we must all admit to agnosticism in greater or less degrees. Do I know what consciousness is? Heck no! Do I know who God is or even if he/she/it exists? Heck no! But, that of course does not prevent us from making some belief and life commitments based on the best evidence available to us. But, if we all agreed that we would only discuss or entertain ideas we could definitely prove, our range of discussion and thought would become pretty limited. And, not sure how we would grow and change in our beliefs and ideas.