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Bitcoin is in beta. These are early days. It can still go to zero or to the moon any anyone who knows which of those it will be is ignoring too many issues to be worth taking their advice.
Absolutely, bitcoin's multi-decade outlook is overwhelmingly binary. But I don't think it naturally follows that in the bitcoin-fail case, gold reigns supreme. Bitcoin shows that there IS a solution to the problem of having an ideal money in an internet-centric era. Whether the mechanics of what we call bitcoin today turn out to work sufficiently well or not, seems somewhat immaterial. Two things should remain obvious:
1) Modern economies need near-instant transactions over any distance.
2) Hunks of physical metal cannot accommodate #1 without "backing", and backing == counterparty risk, which essentially relegates the scheme to the same class as fiat.
Whether bitcoin succeeds or fails, gold just doesn't cut it if we have a global electronic society.
That's not to say Goat's 5% PMs strategy is incorrect; if you think there's a non-immaterial chance of basically everything based on electricity going away but society and trade more or less still existing in a civil fashion, sure.