At any rate, it's no more possible to "prove" your claim that natural rights can be a useful fiction
The evidence of how and why human rights are important is everywhere. I see it every single day in my job, when we're reminded about the rights of disabled children to receive a decent education, to be treated with dignity, to have their own feelings and desires properly represented when decisions are made which affect them.
You talk about the revolution which is supposedly just around the corner, as it has been for a century and a half now. But, in the meantime, there has been a real revolution taking place in the standards of treatment and protection that people expect to receive, and at the very core of this has been the notion that all humans have rights which should be respected. This has affected a range of issues so broad and diverse to defy easy accounting, but which includes such staples of political discourse as ethnicity, sexuality and gender (including, of course, matters of reproductive ethics, where the notion that women have a right to bodily autonomy is fundamental to the Pro-Choice case).
In each case, the essential argument, the one which has driven change most effectively and reliably, has been founded in a language of rights. To this day, when you hear voices raised in protest at the crimes committed by this state or that corporation, the claim for rights to be respected is shown time and again as one to which heed is paid, around which support can coalesce, and through which democratic force can be exercised in pursuit of change. And, what's more, it's an argument which can be turned into actual practice in a quite straightforward (which is not to say effortless) manner, through the establishment of legal rights backed up by the force of the state.
Against all this, we have an argument founded entirely on your faith that, this time, the millennium really has arrived...
