Gold was used as Cash and as a Store of value.
Paper Money is Cash and no store of value
BTC is a Store of value and no Cash
BCH is a Store of value and Cash
There where 2 problems with Gold: Its very heavy and difficult to split in smaller amounts.
With BCH all this problems are gone and its already scaleable not sometime in the future.
Just check it Yourelf: https://en.wikipedia.org/wiki/Gold_standard