I won't pretend to know about lucky strike mining, interplanetary resource content or whatever wild variable like that.
I do know the US economy is grim and there is no mass faith in a bright future for it. I do know silver usage rate (via tech,healthcare) is outpacing the ability to drudge it from the Earth.
I think it has good investment potential for the simple reason of demand being higher than supply. The dollar turning to toilet paper,interest rates on cash being nada certainly helps too as it leaves investors with pick something or watch it stagnate. However if you aren't already holding it that opportunity may have already passed.
Just looking at the chart its rise has been reasonable since the meltdown. Recently it has gotten scary. So scary I don't trust it and I certainly wouldn't want to buy into something at a very high/ exceptionally erratic fear/scheme driven price. The crazy has started and you can never tell when it will end.
I see silver as a should have then and a very foolish move to buy now.