Even when there are applications built on Bitcoin, people like Peter still won't get it. To stick with your metaphor, even if he sees the shine and we built jewelry or electronics with gold he'd insist they'll corrode and fail any day now.

He thinks money has to be a commodity and that it's not merely a coincidence that some commodities historically have also been used as money. People like him are hopeless until they realize money is a ledger and that the market picks the one with the best features.