>Turing (and Ex Machina) argue that this is the only possible test, largely because arguments about consciousness dissolve into circular meaninglessness. Daniel Dennett dispenses with this best in his essay Quining Qualia: http://cogprints.org/254/1/quinqual.htm

True but for the same reason, models of consciousness dissolve into circular ontologies of subject and object. I agree with you on Spinoza. Seeing consciousness as a qualitative property of the universe avoids this problem and ties up alot of loose ends. That doesn't imply artificial consciousness is impossible. It implies on some level artificial consciousness will always be a blackbox system to us. One we can maybe replicate and improve on but still beyond full logical comprehension.