'1984' and 'Brave New World' are not within the periphery of consideration of everyday dissidents when talking about authoritarianism or protest in China (it's not part of the currency). If these tomes became a tool and entered the consciousness or became a vehicle for discussion and dissent then they would be banned. Why ban something almost no one is entirely aware of. It'd be like Iran banning Chinese authors. It makes little sense. It's not pragmatic.