What I mean here concretely is failure/bankruptcy of the current system after people get fed up, and re-emergence/prioritization of institutions of justice and rule of law.
This may be just a dream however. Don't hold your breath.
> Gold is no currency at all in the sense of a common trade value
I don't mind it not being a commonly transacted medium if I can buy and sell it without a lot of fees. For my purposes, even cheap good cars or real estate constitute a store of value, albeit less liquid ones.
> Labor is the only kind of value and any "worth"
Value is in the eye of the beholder. If I value my productivity less than you do yours, I might not accept payment in work.