Thats what the guy on xapo said on the ted talk, BTC may challenge gold as a store of wealth, that is way more realistic than challenging fiat national currencies. I tend to agree with this view.
If BTC replaces gold as a store of wealth, it would
automatically be a strong candidate for world reserve currency. If gold could be sent over the internet and used to settle trades, do you think countries would bother with using USD?
.
You've got a scaling problem. $10 billion market cap versus $200 trillion in global wealth.