The theory that there is nothing but zombies runs into the difficulty of explaining why many of them would believe they are non-zombies. The standard p-zombie argument, that you can have qualia-less functional duplicates of non-zombies does not have that problem.
The standard p-zombie argument still has a problem explaining why p-zombies claim to be conscious. It leaves no role for consciousness in explaining why conscious humans talk of being conscious. It's a short road (for a philosopher) to then argue that consciousness plays no role, and we're back with consciousness as either an epiphenomenon or non-existent, and the problem of why -- especially when consciousness is conceded to exist, but cause nothing -- the non-conscious system claims to be conscious.
Another month has passed and here is a new rationality quotes thread. The usual rules are: