Nobody uses silver as money therefore it isn't money. It is used as an industrial metal therefore that is what it is. No different from copper, steel etc. I would accept silver as payment too, but only because it has a value that I can convert to something else that I can spend. Again, no different to copper etc.
The GSR will go where it will go, depending on it's price and the price of gold; obvious, yes. It could keep going up just the same as it could go down. My point is just because it was 16 150 years ago has no bearing on where it will go in the future. Nobody knows. If you want to see people using arguments to convince themselves, it's the "reversion to the mean" type historical ones that typify this IMO.