If your speculation is that consciousness is rooted in the hardware, then synthetic consciousness is an engineering problem, and humanity is very good at solving engineering problems. The fact is, the only thing scientists have found that is really different between the neurons in simple life forms such as jellyfish and us is the level of complexity, hence the speculation of consciousness being emergent behavior. Again, I don't know, and I haven't heard of scientists definitively knowing the source of consciousness, either, which is why I continue to maintain that we don't know if we can create synthetic consciousness because it's really hard to make something if you don't know how it works. As far as our current crop of tech bros, they seem to be relying on the idea of emergent behavior, hence the need for ever-more-complex artificial intelligence. I think they're behaving like cargo cults, building something that superficially resembles the thing they want and hoping it just starts to mystically work. Them being wrong, just like cargo cults and airplanes, doesn't mean it isn't possible to create a synthetic consciousness.