At the moment the purchasing power of cash is plummeting as inflation is starting to let rip. There are various thoughts around how long this will last but at the rate it is occurring combined with the huge debt levels in western society the blunt tool of (significant) interest rate rises is being delayed which IMO is a big mistake.
The stock market is volatile, crypo is wildly unpredictable, property is wobbling even gold after some significant years of gains is looking uncertain.
Against all this uncertainty physical assets whether art, wine, cars or guitars may well tempt those looking for a home for their cash. Nothing is certain but the safe havens of the past look very uncertain.