Everything that has value (a car, a factory, a stick of gum, even a bitcoin) is a store of value to some degree.  Fiat money too is a store of value, though a poor one--by design.  It makes investment more profitable than hoarding.  A "good" store of value, OTOH, discourages investment and encourages hoarding.
My point is trivial: if gold and similar "stores of value" vanished tomorrow, initial economic consequences would be less than catastrophic.  Eventually, the economy would do better without it.