Gold remains relevant and valuable in every decade. There are precious minerals that are more expensive than Gold, but gold price remain non depreciating on second hand stock.
Now talking about it usage in electrical conductivity, some would argue that there are many wireless devices, therefore the value of gold will reduce, but this is not through because gold is a store of value.
Gold is mostly used in jewelry and for building precious ornaments like rings, necklaces, etc so it is not really used for any kind of wiring. Yes, even in this year gold is been used in some of the technical gadgets but the prices of those gadgets too is much higher and it does not benefit the firm manufacturing such devices and hence they have shifted onto other metals possessing the properties of gold but at a cheaper rate.
Gold is also malleable which allows us to mold it without actually destroying its components also we all know the properties of gold which makes it one of the most precious metal on the earth. The precious nature of gold does not make it highly usable in the wiring or the electrical devices.