I'm a skeptic, as I would certainly prefer to hold $10,000 of FB shares than $10,000 worth of Bitcoin. The problem is that Bitcoin is not productive, so it onl

I'm a skeptic, as I would certainly prefer to hold $10,000 of FB shares than $10,000 worth of Bitcoin. The problem is that Bitcoin is not productive, so it only makes sense to own it if someone will pay more for it in future. But how do I estimate that without any long-term price history? I can see that the demand for gold increased in, say, 7 of the last 10 decades so that would give me some confidence about demand over the next decade. So to answer your question: the only thing I can see that will change my opinion of Bitcoin is if demand generally increases over many decades.