Ultimately, I think it comes down to these questions, which I don't think are easy for either of us to answer: If we meet a silicon creature that seems to be conscious: 1. how can you change your mind and decide it is conscious? 2. how can I change my mind and decide it's not? I don't have a good answer for either one
I think ultimately a better understanding of the relationship between the brain and consciousness will settle these questions. I also think deep meditation on the nature of simulation vs duplication could clarify a few things too.