It has been debated for a long time and I think that perhaps a few years ago it was seen as more feasible, but now I think that its widespread use as a currency most people believe is not viable. What it is is the best store of value, so it is used and will continue to be used. So I think the OP is partly right on the reserve part but not on the currency part.

Today gold is not a currency, although it was in the past, and the reserve currency is instead the dollar. Bitcoin has emerged as an enhanced digital gold, which I increasingly believe will replace gold as a hedge.