There's one problem in silver: there's less of it above ground than gold, and it has many more applications. There SIMPLY ISN'T ENOUGH Silver to use it as money again! And people worry about silver supply going up. In a different world, we WILL need more, lest we find some passable but inferior substitute.
I shudder when I think what could happen to silver prices. I've built my silver hoard - time for more silver mines! That's where the value lies now.