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> The USD is on a failed gold standard.

The gold standard was removed in the 1970s. There has been no value behind the dollar since then. During the same time, the US Gov't actually seized citizen's gold.

> The obvious problem is the concept that money from this period should be valid in any future period with no decay or costs associated with holding the money.

This statement is confusing to me. Are you saying that there is not time-cost to the holder of cash if that cash is backed by gold? That is, if I have 100USD (gold backed) there is no downside to holding that cash as opposed to spending it?

> The only known solution is to get rid of cash or to introduce some sort of time bound money like demurrage currencies.

You may like the idea of CBDCs, then. With a centrally controlled digital currency it would be possible to put expiration dates on cash in order to force people to spend their money. Hyper-inflation has the same affect, though. If you look at the Argentine economy and how people spend money with 40-200% inflation year-over-year, you'll see that no one holds onto their cash. They all spend their cash in a very short period of time. People convert the currency that cannot store value into things that can; things like goods, US dollars, crypto currencies, etc.

[edit for spelling]