This sounds fairly reasonable. I own silver coins, mainly because I like to collect them (Proofs and also some rolls (about 4) of Uncirculated). About the only way I see using them for my "daily commerce" is in the event of total collapse of the US economy or a war of such magnitude that we all get bombed to the Stone Age. Are these scenarios possible? Yes. Are they probable? I do not believe so.
If civilization turns to anarchy along the lines of the fall of the Roman empire and the beginning of the Dark Ages, am I really going to find someone stupid-enough to trade me his last food, water, guns, and bullets for a couple of useless discs of silver?
How long would such an idiot survive in such a scenario?