for gold to resume its role as a currency Armageddon would have to result with obliteration of electricity and of the internet. absent that, Bitcoin will win. i'm not so dour on our future prospects.
In that scenario - bullets and bottles of strong liquor make a better currency than gold.
Gold - I don't know why anyone really cares about it, I honestly think the majority of its value comes from the old folk and their old thinking
My generation will refuse to inherit all the problems of the current worlds financial systems (fiat, etc) and will easily recognize the value of something like bitcoin and brainwallets over gold.
Silver is still cheap enough and has enough industrial purpose to keep my interest at the moment.